[decomp] get started on entity

[water111]

Unfortunately we aren't quite ready to do this entire file, but I at least got it started and learned a lot about the entity/actor/camera/ambient system.

Here's a screenshot of the green sage's hut, with entity marks and visiblity.

[coveralls]

Pull Request Test Coverage Report for Build 1186567302

• 50 of 83 (60.24%) changed or added relevant lines in 5 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.005%) to 64.748%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
goalc/compiler/compilation/Static.cpp	9	10	90.0%
game/system/newpad.cpp	0	2	0.0%
decompiler/util/data_decompile.cpp	7	12	58.33%
decompiler/IR2/bitfields.cpp	33	58	56.9%

Files with Coverage Reduction	New Missed Lines	%
decompiler/util/data_decompile.cpp	1	53.41%
goalc/listener/Listener.cpp	3	84.29%

Totals
Change from base Build 1179886176:	-0.005%
Covered Lines:	39807
Relevant Lines:	61480

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💛 - Coveralls