* Ported the project to CMake
  * Android and Mac support dropped for the time
being.
  * Tests, BASS and Discord-RPC are now options
* Restructured and reformated the project.
  * Merged `include` and `src`
  * Renamed `resource` to `data`
  * Renamed various files
  * External libraries headers are no longer included in `src`
  * Replaced header guards with #pragma once
  * Multiple refactors (keywords, headers)
  * Added Qt6 compatibility
* Removed various unused functions and headers
* Reworked AOPacket
  * When content is passed to AOPacket, it should be ensured that the content is already decoded.
  * Encoding/decoding are now static methods.
* Fixed various memory leaks
* Removed animation code for AOImage
  * AOImage is always using static images
* Simplified ChatLogPiece

If you don't want to see this commit on blames, use the hidden
whitespace option on GitHub, or use `-w` in git-blame.

Due to a countless number of changes made to the core that were not
fully understood, tested, or documented, it was decided to roll
everything back to the last known stable version (2.6.2).

Changes dropped include:
 - Witness needed
 - Shake
 - Frame SFX
 - Multiple custom objections
 - Multithreaded thumbnail generation
 - Looping
 - Various translation additions
 - "Mirror IC"
 - Color in IC log
 - An invocation of clang-format

Next time, work together and split your big fork into independently
testable feature branches.

{ BasedOnStyle: LLVM, BreakBeforeBraces: Stroustrup}

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(this is the Visual Studio preset with only "BreakBeforeBraces" changed from Allman to Stroustrup)

Indentation fixed to 2 spaces per tab. Braces set to Stroustrup style.
Lines reflow at 80 characters. One-line method bodies are on the same
line as the signature. Space always after `//`. No indentation
on preprocessor macros. Includes are sorted lexicographically.

If you don't want to see this commit on blames, use the hidden
whitespace option on GitHub, or use `-w` in git-blame.