Log Message:
atari800: updated to 4.1.0

Version 4.1.0:

New Features:
* Atari800 now includes Altirra BIOS-es for all emulated systems: 400/800,
  XL/XE, and 5200; as well as Altirra BASIC. It is now possible to use the
  emulator without providing any ROM images.

* The Altirra OS-es and Altirra BASIC can now be selected by users in the
  "System settings", if they want to use them. Previously Altirra OS \ 
was used
  automatically only when no other OS ROMs were found.

* joyhat support for all four real joysticks, configurable in CLI/cfg/TUI

Notable changes:
* All documentation specific to building Atari800 on Windows has been moved
  from DOC/INSTALL to a new file, DOC/BUILD.windows. This document
  has also been expanded with a new chapter covering building Atari800 using
  MSYS2.

* Ability to use the built-in EmuOS firmware has been removed. Users wishing
  to run Atari800 without providing OS ROMs now have an option of using the
  built-in Altirra OS-es, which are compatible with much more Atari software
  than EmuOS.
  At the same time, it is still possible to compile a version of Atari800
  without any OS ROMs built in, by means of the --disable-altirra_bios
  configure option.

Port specific improvements:
== Atari Falcon ==
* More Videl/screen handling fixes
* Ability to run Atari800 in an AES-less environment
* Replaced C2P with MMU friendly and faster code
* Atari800 should run on all TOS clones with XBIOS Sound API

== Android ==
* Fixed building of the Android target, broken in the previous release.
* Fixed labels on console keys (unreadable on hi-res displays)
* Fixed console keys press detection
* Fixed "right-handed joystick" trigger press

== Raspberry Pi ==
* updated build documentation
* find proper Broadcom GLes libraries
* fixed bug in GRAPHICS 9 (shifted colors)

== MS Windows ==
* updated build documentation

General Fixes:
* updated build documentation
* it is possible to build atari800 out of source tree
* unconnected host joysticks initialized properly, fixes the MULE game