MSX emulator has been updated - openMSX.

This is a major release, in which we introduce the new Graphical User Interface, replacing the OSD menu. A faster and more powerful debugger is now included in openMSX itself. Configuration for MSX joystick/JoyMega has been improved drastically using the new GUI.
As of now, a system with OpenGL 2 support is required to run openMSX.

MSX device support:
- OPL4: fixed detail in YMF262 register mirroring
- turboR PCM:
 - fixed sample frequency to 15700Hz (not 15750Hz as found in some documentation)
 - implement sample buffer (bit 0 on port 0xA5) to improve sound quality
- flash ROMs: added a lot of accuracy to its emulation
- WD2793 and TC8566AF FDC's: fixed several details
- Konami mapper: added missing mirroring
- improvements on I8254 mode 3 used in some RS-232C interfaces
- added support for the concept 16-bit NEO mappers, which may be used by someone in the future. If this doesn't happen, support will be dropped again
- added support for the ASCII16-X mapper which will be used by some upcoming games
- fixed mapper of Mitsubishi ML-TS2 modem software
- added support for Circuit Designer RD dongle
- added new machines/extensions:
 - Hitachi MPF-310H
 - Hitachi MB-H70
 - USA version of Yamaha CX5M
 - National CF-SM003
 - German Spectravideo SVI-738
 - French Canon V-20
 - Yeno DPC-64
 - Hitachi MB-H21
 - Sony HB-T600
 - Others: Philips VU-0040, General Paxon PCT-55, Sanyo MPC-64, OPL3 Cartridge with Moonsound compatible port mapping
 
New or improved emulator features:
- removed SDL renderer
- added new GUI:
 - main menu bar with these menu items:
  - Machine
   - Select MSX machine
   - Firmware switch
   - Pause emulator
   - Reset MSX
   - Power on/off
   - Test MSX hardware (much faster than in Catapult)
  - Media
   - Cartridge slots with ROM cartridges or extensions
   - Disk drives
   - Tape deck
   - Hard disk
   - CD-ROM
   - Laserdisc
  - Connectors
   - joystick ports, printer ports, MIDI ports, etc
  - Save state
   - Load/Save state
   - Load/Save replay
   - Reverse/replay settings
  - Tools
   - Virtual keyboard
   - Copy/paste
   - Capture audio/video/screenshot
   - Disk Manipulator
   - Trainer
   - Cheat Finder
   - SCC viewer
   - Audio channel viewer
   - OSD Toys
  - Settings
   - Video
   - Sound
   - Speed
   - Input
    - Configure MSX joysticks
   - GUI
    - Configure GUI shortcuts
   - Misc
    - Configure OSD icons, show status bar
  - Debugger
   - Toolbar
   - Disassembly view
   - CPU registers
   - CPU flags
   - Slots
   - Stack
   - Breakpoints
   - Symbol Manager
   - Watch expressions
   - Bitmap viewer
   - Tile viewer
   - Sprite viewer
   - VDP register viewer
   - Palette
   - Hex editor
  - Help
   - Links to manuals
   - About
 - Reverse bar
 - OSD icons
 - Status bar
 - Console
 - Messages
 - Drag and drop
 - Shortcuts
 - Separate pop-out windows
 - Windows can be docked on other windows or in a tab widget
 - 3 styles: Dark (default), Light, Classic
 - configurable font and font size. Default: DejaVu
- OSD menu:
 - removed in favour of new GUI
- only warn once for unsupported size in Konami mappers
- suppress warning messages during reversing
- fully configurable MSX controller mapping for joysticks (msxjoystick1/2 pluggables) and JoyMega devices (joymega1/2 pluggables)
- low level debugger (scripting):
 - added support for symbol management
- allow to set a breakpoint (or any Tcl callback) when the VDP dot clock direction is written "wrongly"
- added VGM recording for OPL3
- added minimal support for unplugging and replugging host controllers
- added support for RS232Net: connect MSX RS-232C interfaces to the local network
- removed several OSD scripts which have been replaced by the GUI, sometimes almost 1 to 1: 
 - reverse bar
 - tile viewer
 - sprite viewer
 - palette editor
 - VDP register viewer
 - tabbed machine view
 - display_message
 - quit menu
 - OSD keyboard
 - load_icons
- removed support for savestates with .xml.gz extension
- do not save SRAM to file if unmodified
- added support to run openMSX fully in headless mode
- allow to specify the device name of IDE devices in their config XML file
- base the Boosted MSX2 EN on the Philips NMS 8245 instead of 8250
- fixed crash when multiple debug-devices were used at once
- fixed possible crash on specific combination of watchpoints and replay
- fixed possible crash on no longer supported savestates:
 - we try to keep old savestates working. Nevertheless occasionally we do remove stuff. Loading an old savestate which contains such stuff used to crash, now we give a clean error message
- fixes for load_settings command

Build system, packaging, documentation:
- added support for loongarch
- required GNU compiler is now at least g++-11
- required clang compiler is at least clang++-16
- required Visual Studio Compiler is at least 2022
- on macOS, at least Xcode 15.4 is required
- Android build is totally broken, and will require a lot of effort and help to get back up, which is not planned by us.
- 3rd party updates of SDL (2.30.1), SDL2_ttf (2.22.0), GLEW (2.2.0)
- added patch to add aarch64 support to libtheora 3rdparty build
- fixed link error in libvorbis for Xcode 15 on macOS
- avoid pkg-config build error with Clang 15 on macOS
- quite a large update of the manual (mostly to include the new GUI)