[game] improve loading

[water111]

this makes the fr3 files smaller and improves loading so there aren't dropped frames when switching levels. Previously there was >100 ms pauses on load.

The lava tube fr3 went from 50 MB to 15 MB. I just used zstd and I think we could do even better with a smarter packer, but this is probably good enough.

[coveralls]

Pull Request Test Coverage Report for Build 1647770979

• 0 of 317 (0.0%) changed or added relevant lines in 6 files are covered.
• 9 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-0.08%) to 53.166%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
game/graphics/opengl_renderer/tfrag/Tfrag3.h	0	1	0.0%
game/graphics/opengl_renderer/tfrag/Tie3.h	0	1	0.0%
decompiler/level_extractor/extract_level.cpp	0	5	0.0%
game/graphics/opengl_renderer/Loader.cpp	0	37	0.0%
game/graphics/opengl_renderer/tfrag/Tfrag3.cpp	0	122	0.0%
game/graphics/opengl_renderer/tfrag/Tie3.cpp	0	151	0.0%

Files with Coverage Reduction	New Missed Lines	%
decompiler/level_extractor/extract_tie.cpp	1	0%
game/graphics/opengl_renderer/Loader.cpp	1	0%
game/graphics/opengl_renderer/tfrag/Tie3.cpp	1	0%
game/graphics/opengl_renderer/tfrag/Tfrag3.cpp	3	0%
goalc/listener/Listener.cpp	3	84.35%

Totals
Change from base Build 1647396460:	-0.08%
Covered Lines:	40850
Relevant Lines:	76835

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💛 - Coveralls