Move gResearch* globals to GameState_t #2032

Job	Run time
Check changelog formatting	6s
Lint Commit Message	0s
Check code formatting	44s
Linux (Debug, [http, network, flac, vorbis OpenGL] disabled) using clang	11m 11s
Linux (Debug) using clang, coverage enabled	12m 29s
Linux (x86_64, AppImage)	8m 38s
Android	10m 58s
Linux (docker)	0s
Linux (x86_64, focal, portable)	8m 30s
macOS (x64) using CMake	13m 3s
Linux (x86_64, jammy, portable)	9m 50s
Windows (win32)	8m 21s
macOS (arm64) using CMake	7m 0s
Windows (win32) using mingw	8m 39s
Windows (x64)	8m 18s
Linux (x86_64, bullseye, portable)	9m 33s
Windows (arm64)	8m 15s
Linux (i686, focal, portable)	8m 43s
macOS universal app bundle	1m 21s
	2h 15m 39s

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