Update notes: Release 20210321 to Release 20230225

TODO

• Mention https://github.com/OpenRA/OpenRA/pull/19444 - "Mod defined flash image"
• https://github.com/OpenRA/OpenRA/pull/19335 - "Overhaul player color logic"
• https://github.com/OpenRA/OpenRA/pull/19297 - "Refactor parts of the GameSpeed system"
• https://github.com/OpenRA/OpenRA/pull/18728 - "Replace hardcoded tilesets with mod-defined tileset loaders"
• Translation https://github.com/OpenRA/OpenRA/pull/18959, / https://github.com/OpenRA/OpenRA/pull/18965, https://github.com/OpenRA/OpenRA/pull/19847
• https://github.com/OpenRA/OpenRA/pull/18916 - "Added support to detect game installations by uninstaller location"
• https://github.com/OpenRA/OpenRA/pull/19460 - "Rebinding Chat Hotkeys"
• https://github.com/OpenRA/OpenRA/pull/19780 - "Update to .NET 6"
• https://github.com/OpenRA/OpenRA/pull/19666 - "Make control group hotkeys configurable" -> New ControlGroups trait on ^BaseWorld and UI changes
• https://github.com/OpenRA/OpenRA/pull/19504 - "Allow mods to replace UnitOrderGenerator with their own default."
• https://github.com/OpenRA/OpenRA/pull/18773 - Removed hard-coded .vqa assumptions from the engine

UI:

• https://github.com/OpenRA/OpenRA/pull/18948 - "Split settings panels logic and add support for custom panels"
• https://github.com/OpenRA/OpenRA/pull/19461 - "Display lobby options in-game on a dedicated tab"
• https://github.com/OpenRA/OpenRA/pull/19503 - "Fix faction suffix chrome issues"
• https://github.com/OpenRA/OpenRA/pull/19681 - "Streamline sizes of several UI panels"
• https://github.com/OpenRA/OpenRA/pull/19677 - "Overhaul settings panel layout"
• https://github.com/OpenRA/OpenRA/pull/19143 - "Asset Browser File Formats were split into groups"
• https://github.com/OpenRA/OpenRA/pull/19895 - "Create overlays dropdown" ...
• https://github.com/OpenRA/OpenRA/pull/20033 - Add support for readonly hotkeys and expose chat input hotkeys
• https://github.com/OpenRA/OpenRA/pull/19458 - Add a dedicated widget for transient notifications