Project/Draw: Implement GpuMemAllocator

[MonsterDruide1]

An unfinished header by @fruityloops1 resulted in me looking into the remaining part of this class - implementing it on the way.

Two mismatches can currently be observed:
1) https://decomp.me/scratch/QhCcn - within GPUMemBlockT's destructor. It was probably wrong before, and is now being exposed because the function is generated for the first time.
2) https://decomp.me/scratch/nhsZ0 - al::GpuMemAllocator::allocMemory shows some slightly different codegen on an if with arithmetic.
All mismatches have been fixed by @german77 and me!

Blocked by open-ead/agl#18

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This change is 

[MonsterDruide1]

Ready for review.

[fruityloops1]

Reviewed 1 of 3 files at r1, all commit messages.
Reviewable status: 1 of 3 files reviewed, 1 unresolved discussion (waiting on @MonsterDruide1)

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lib/al/Project/Draw/GpuMemAllocator.h line 23 at r1 (raw file):

    ~GpuMemAllocator();

    void createMemory(const char*, s32, sead::Heap*, s32, agl::MemoryAttribute);

Param names?

[MonsterDruide1]

Reviewable status: 1 of 3 files reviewed, 1 unresolved discussion (waiting on @fruityloops1 and @MonsterDruide1)

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lib/al/Project/Draw/GpuMemAllocator.h line 23 at r1 (raw file):

Previously, fruityloops1 (Fruityloops) wrote…

Param names?

Done.

[fruityloops1]

Reviewed 1 of 3 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @MonsterDruide1)