Add RCT2 Thumbnail Colour Preset to Observation #269

Job	Run time
g2.dat	6s
Check code formatting	43s
Lint Commit Message	0s
Check changelog formatting	6s
Android	2m 23s
Ubuntu Linux (AppImage, x86_64)	1m 35s
Ubuntu Linux (jammy, debug, [http, network, flac, vorbis OpenGL] disabled) using clang	1m 14s
Ubuntu Linux (debug) using clang, coverage enabled	5m 23s
Ubuntu Linux (jammy, x86_64, portable)	2m 17s
Ubuntu Linux (Docker)	0s
macOS (x64) using CMake	2m 7s
Debian Linux (bullseye, x86_64, portable)	1m 52s
Windows (win32)	9m 24s
macOS (arm64) using CMake	1m 41s
Ubuntu Linux (jammy, i686, portable)	2m 27s
Windows (x64)	9m 31s
Windows (win32) using mingw	1m 15s
Windows (arm64)	9m 33s
macOS universal app bundle	42s
	52m 19s

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