fix cnc menu/multiplayer titles overrides by server's title;
spelling fix
add tab cycle key to setting GUI
fixes #2791 don't crash on powerdown hotkey when playing cnc
pull cnc sell/repair button hotkeys from settings
fixes #2785 don't crash when last player leaves game in cnc
add --docs flag for utility
ship a proper SDK for modders

including the OpenRA.TilesetBuilder.exe fixes #2316
and auto-generated trait documentation fixes #2437
compile Markdown to HTML for offline use
purge external files from the doc folder (moved to Wiki)
remove unused non-free Dune 2000 font
added contrast to range circle
Merge pull request #2804 from bidifx/range-circle

added contrast to range circle
added Sascha Biedermann to AUTHORS
embed the previously manually edited outdated documentation

from https://github.com/OpenRA/OpenRA/wiki/Trait-Documentation
automatically update the wiki documentation each release
fixes #2795: cancel chat with esc
Merge pull request #2810 from bidifx/cancel-chat

cancel ingame-chat with esc
Merge pull request #2808 from Mailaender/trait-documentation

Auto-Generated Trait Documentation
fixes #2799: double click on server to join
Merge pull request #2809 from bidifx/dblclick

double click on server to join
radoc tidy
Merge pull request #2816 from ScottNZ/radoc

radoc tidy