v1.2-beta1: DCS briefing tab, improved non-VR compatibility

Before installing: this might not be the latest release - you can always get the latest release here

Start by downloading OpenKneeboard-v1.2-beta1.msix, then read the README; there is additional documentation available.

This release:

• adds a DCS mission briefing tab
  • for reference, this includes the bullseye magnetic variation
    and coordinates in various formats
  • if the current aircraft is an A-10C, this includes CDU LASTE wind
    correction data
• improves non-VR compatibility, particularly with Falcon BMS
• adds a max-width setting
• added missing horizontal line to radio log when mission is restarted
• plugging in/unplugging game controllers while OpenKneeboard is running
  is now fully supported
• the plain text tab now updates when the file is modified
• in Oculus and OpenXR, the active kneeboard is now shown on top of the
  inactive kneeboard if they are on the same plane
• fix UI for binding button combinations
• fixed crash if all tabs are removed
• renamed 'RemoteControls' zip to 'Utilities'
• OpenKneeboard-Launch-WindowsApp.exe is now included in the MSIX, and
  installed to %PROGRAMDATA%\OpenKneeboard on first run
• added 'check for updates' to help page
• added third-party acknowledgements and license info to help page
• internal efficiency improvements (fewer threads)
• fixed several crashes-on-exit

The briefing tab may not work with all missions; if you find any
problems or incompatibilities, please open a GitHub issue, and include:

• the .miz file if possible
• which aircraft and side you are playing for
• which game mode you are playing
• any generators you are using - liberation, pydcs, rotorops etc