Log Message:
stella: Update to 6.1

6.0.2 to 6.1: (March 22, 2020)

  * IMPORTANT NOTES:
    - Because of major event remapping changes, all remappings will be reset
      to defaults; if you had custom mappings, they will need to be
      re-entered again.

    - Because of major internal changes, all state files are now invalid.

    - Support for Windows XP has been discontinued as of this version.  WinXP
      is now completely out of support from Microsoft, so we are doing the
      same.

  * Major improvements to display mode handling in NTSC vs. PAL.  The window
    is now the same size for both modes, and scaling is applied to simulate
    the height of scanlines (in PAL mode, there are more scanlines and hence
    each is narrower).  This more properly emulates how the display would look
    on a real TV.

  * Removed the 'Display_Height' property, changing it to 'Display_VCenter'.
    This new feature, along with the display mode changes above, almost
    completely eliminate having to manually tweak each ROM so that it will
    not have part of the image cut off.

  * Removed the 'Display_YStart' property and all automatic detection of
    ystart.  It caused problems on some ROMs, and was not the way a real
    console would work anyway.  Related to this, ROMs now load much faster.

  * Major improvements to event remapping:
    - Allow mapping of modifier-key and button-direction combinations
    - Physical controllers can map the same action to different events on
      different virtual controllers
    - Many more events can be remapped
    - Events can be filtered by type in UI

  * Paths have been simplified:
    - The following file/directory locations are no longer configurable
      (statedir, nvramdir, cheatfile, palettefile, propsfile); they are
      now all under the base directory
    - Removed cfgdir; Distella config files are now placed with their
      associated ROMs
    - Added 'basedir' commandline argument, which allows to change the
      base directory where almost all config-related items are stored;
      related to this, discontinued the 'basedir.txt' functionality
    - Added 'baseinappdir' commandline argument, which sets the base
      directory to the application folder (Windows only for now); this
      replaces the functionality of 'basedir.txt'

  * Added automatic controller detection.

  * Controllers can be changed during emulation (no ROM reload required
    anymore).

  * Added support for Light Gun controller.

  * Added limited KidVid support (8, 9 and 0 start the games).

  * Removed superfluous controller option 'PADDLES_IDIR'.

  * Added configurable paddle dejittering.

  * Key-repeat mode improved; entering Time Machine by holding down a key
    combo continues to send events (previously, you had to release and then
    press the combo again).

  * Certain buttons in the UI can now be activated repeatedly by holding
    down the mouse button (Time Machine, debugger step/trace/frame advance,
    etc.)

  * Added option to configure mouse double click speed.

  * Added option to configure controller input repeat speed.

  * Added high quality scaling.

  * Made scanlines better aligned to scaling.

  * Added 'HiDPI' mode, which scales the UI by 2x when enabled.  This is
    meant for 4k and above monitors, but can actually be used at any
    lower resolution that is large enough to display the scaled UI.

  * Fixed TIA 'Center' option, Stella now remembers the last windowed position.

  * Added fractional (25% increments) TIA zooms.

  * Removed 'tia.fsfill' option, replacing it with 'tia.fs_stretch'.  This
    new option allows to preserve TIA image aspect ratio in fullscreen
    mode, or stretch to fill the entire screen.

  * Added configurable 'Overscan' option for fullscreen modes.

  * Fullscreen TIA modes no longer assume that desktop taskbars, etc
    are present, hence they are scaled to the proper fullscreen size.

  * Added option to display dialogs in screen corners.

  * Added hotkey for sound on/off.

  * Enhanced 'Command' menu to display current state and more commands.

  * Added option to save and load all TimeMachine states at once.

  * Added option to automatically load/save states when entering/exiting
    emulation.

  * Added option to change pitch of Pitfall II music.

  * ROM Info Viewer size is not limited to fixed zoom steps anymore.

  * ROM Info Viewer can now display multiple lines per property and the
    bank switching type.

  * In file listings, you can now select directories by holding 'Shift' on
    the first character entered.  Entering characters in lowercase still
    selects files, as before.

  * Fixed bug when starting ROMs via MacOS finder.

  * Added various developer options for oddball TIAs:
    - stuffed player, missiles and ball move
    - delayed playfield bits and color
    - delayed players and ball VDEL swap

  * Disabled some developer options for 'Player settings'.

  * Writes to RAM read ports are ignored now.

  * Added Developer setting, which breaks on writes to read ports.

  * Improved breakpoints to now consider the banks.

  * Improved debugger's TIA display and zoom windows.

  * Improved hotkeys, now many emulation keys work in debugger too.

  * Fixed display of negative values in debugger; sometimes they were
    shown as positive.

  * Reworked ROM properties database, making it load faster in certain cases.

  * Updated internal ROM properties database to ROM-Hunter version 16
    (thanks go to RomHunter for his tireless research in this area).
    Related to this, updated the snapshot collection.

  * Fixed 'Dancing Plate (Unknown) (PAL)' to use joystick.

  * Fixed cheatcode handling in 2K and 4K ROMs.

  * Fixed bug where ROMs smaller than 64 bytes were not recognized.

  * Fixed bug where frying one ROM was continued with the next ROM.

  * Fixed not working 7800 pause key.

  * Enhanced UA bankswitching to support certain Brazilian carts.

  * Fixed WD bankswitching.

  * Added FC bankswitching for Amiga's Power Play Arcade Video Game Album.

  * Added auto-detection of display format based on filename.

  * Auto-detection of bankswitch scheme by file extension now includes
    more human-readable formats (not restricted to DOS 3-char length).
    See the documentation for the new names.

  * Fixed bug in DPC+ scheme; 'fast fetch mode' was enabled at startup,
    when it should be disabled by default.

  * Some more work on DPC+ playfield 'jitter' effect for certain older DPC+
    driver versions; more ROMs are now detected properly.  Special thanks
    to SpiceWare for his research in this area.

  * Added proper Retron77 port.

  * Added proper libretro port, and fixed display for OpenGLES renderers.

  * PNG/ZIP image support is now conditionally compiled into Stella.
    All major ports (Linux/macOS/Windows) have it enabled by default.

  * SDL/GUI support is now conditionally compiled into Stella.  All major
    ports (Linux/macOS/Windows) have it enabled by default.  This is
    currently needed by the libretro port.

  * Updated included PNG library to latest stable version.

  * Updated UNIX configure script to work with the gcc version 10 and
    above.

-