Log Message:
libvncserver: Update to 0.9.13

# 2020-06-13: Version 0.9.13

0.9.13 truly is a cross-platform release, the best we've ever done in that respect:
Out of the [49 \ 
issues](https://github.com/LibVNC/libvncserver/issues?q=is%3Aclosed+milestone%3A%22Release+0.9.13%22)
closed with this release, 20 alone were related to MS Windows. The result is \ 
that 0.9.13
is the first release with full support for Microsoft Windows! The cross-platform \ 
focused
work did not end there tough: MacOS support was brought up from barebones to a \ 
fully working
production-grade VNC server application. Other highlights are improvements \ 
regarding TLS
in LibVNCClient, \ 
[SetDesktopSize](https://github.com/rfbproto/rfbproto/blob/master/rfbproto.rst#setdesktopsize)
support in LibVNCServer and a major cleanup of the project's documentation. Last \ 
but not
least, 0.9.13 comes with the usual assortment of bugfixes and security improvements.

## Overall changes:
  * Small tweaks to the CMake build system.
  * The macOS server example was overhauled and is now the most feature-complete \ 
sample
	application of the project, ready for real-world use.
  * Lots of documentation updates and markdownifying.
  * The TravisCI continuous integration now also build-checks cross-compilation from
	Linux to Windows.
  * Setup a [Gitter community chat](https://gitter.im/LibVNC/libvncserver) for \ 
the project.

## LibVNCServer/LibVNCClient:
  * Both LibVNCServer and LibVNCClient now support an additional platform, namely
	Microsoft Windows. Building is supported with Visual Studio as well as MingGW.
  * The separate crypto routines used by LibVNCClient and LibVNCServer were \ 
refactored
	into an implementation common to both libraries.
  * Several security issues got fixed.
  * The bundled noVNC client is now at version 1.1.0 and included via a git \ 
submodule.

## LibVNCClient:
  * Added connect timeout as well as read timeout support thanks to Tobias Junghans.
  * Both TLS backends now do proper locking of network operations when multi-threaded
    thanks to Gaurav Ujjwal.
  * Fixed regression in Tight/Raw decoding introduced in 0.9.12 thanks to DRC.
  * Fixed encrypted connections to AnonTLS servers when using the OpenSSL back-end.
	Made possible by the profound research done by Gaurav Ujjwal.

## LibVNCServer:
  * Added a hooking function (`clientFramebufferUpdateRequestHook`) to deliver
	rfbFramebufferUpdateRequest messages from clients to the frame producer
	thanks to Jae Hyun Yoo.
  * Added SetDesktopSize/ExtendedDesktopSize support thanks to Floris Bos.
  * Added multi-threading support for MS Windows.
  * Fixed VNC repeater/proxy functionality that was broken in 0.9.12.
  * Fixed unstable WebSockets connections thanks to Sebastian Kranz.