Turn TrackElemType into a strong enum #2441

Job	Run time
Get version info	17s
Check code formatting	46s
Check changelog formatting	6s
Lint Commit Message	0s
g2.dat	7s
Ubuntu Linux (AppImage, x86_64)	9m 0s
Ubuntu Linux (noble, debug, [http, network, flac, vorbis OpenGL] disabled) using clang	14m 51s
Ubuntu Linux (debug) using clang, coverage enabled	13m 56s
Android	14m 30s
Ubuntu Linux (Docker)	0s
Ubuntu Linux (noble, x86_64, portable)	10m 49s
macOS (x64) using CMake	4m 45s
Debian Linux (bookworm, x86_64, portable)	10m 9s
Windows (win32)	8m 7s
macOS (arm64) using CMake	6m 30s
Windows (win32) using mingw	8m 41s
Windows (x64)	9m 5s
Windows (arm64)	8m 54s
macOS universal app bundle	0s
	2h 0m 33s

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