Add type-ref in static data

[water111]

This adds a type-ref form to the compiler/decompiler to insert a reference to a type in a static object.

There's something weird about this though - the game has type-refs on types that aren't defined yet. When the linker encounters these, it allocates memory for the type, and in order to do this, it needs to know the number of methods. To support this, if the type system can't figure out the number of methods, you can manually add a :method-count argument.

[coveralls]

Pull Request Test Coverage Report for Build 954700138

• 53 of 80 (66.25%) changed or added relevant lines in 9 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.006%) to 69.35%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
decompiler/ObjectFile/LinkedObjectFileCreation.cpp	0	1	0.0%
goalc/compiler/compilation/Static.cpp	15	21	71.43%
common/type_system/TypeSystem.cpp	23	33	69.7%
decompiler/util/data_decompile.cpp	0	10	0.0%

Files with Coverage Reduction	New Missed Lines	%
decompiler/ObjectFile/LinkedObjectFileCreation.cpp	1	0%
game/system/iop_thread.cpp	1	96.08%

Totals
Change from base Build 953624705:	-0.006%
Covered Lines:	36639
Relevant Lines:	52832

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💛 - Coveralls