Match phys::System heap accessors

[RobbyV2]

isHavokMainHeapOom returns true when the Havok main heap free size divided by its total size is below 0.05.

The allocator sits at this+0x78, inside the old _78 padding, so I added HavokMemoryAllocator* mHavokAllocator and shortened the padding to _80.

getPhysicsTempHeap returns mPhysicsTempDefaultHeap when low_priority is LowPriority::No and the current thread priority is at most sead::Thread::cDefaultPriority, dumping that heap first when getMaxAllocatableSize(8) is at most 0x2800. Every other case returns mPhysicsTempLowHeap.

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This change is 

[Pistonight]

@Pistonight made 3 comments.
Reviewable status: 0 of 3 files reviewed, 3 unresolved discussions (waiting on RobbyV2).

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src/KingSystem/Physics/System/physSystem.cpp line 3 at r1 (raw file):

#include "KingSystem/Physics/System/physSystem.h"
#include <heap/seadHeap.h>
#include <thread/seadThread.h>

looks like other files also have this issue but ...
can we put <> imports above "" imports?
( we should probably fix the clang format rules)

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src/KingSystem/Physics/System/physSystem.cpp line 80 at r1 (raw file):

bool System::isHavokMainHeapOom() const {
    return f32(mHavokAllocator->getHeapFreeSize()) / f32(mHavokAllocator->getHeapSize()) < 0.05f;

nit: prefer c++ cast static_cast<f32>

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src/KingSystem/Physics/System/physSystem.cpp line 91 at r1 (raw file):

        return mPhysicsTempDefaultHeap;
    }
    return mPhysicsTempLowHeap;

does changing to guard-style work?

if (low_priority != LowPriority::No) {
   return mPhysicsTempLowHeap;
}
if (sead::ThreadMgr::instance()->getCurrentThread()->getPriority() > sead::Thread::cDefaultPriority) {
   return mPhysicsTempLowHeap;
}
if (mPhysicsTempDefaultHeap->getMaxAllocatableSize(8) <= 0x2800)
            mPhysicsTempDefaultHeap->dump();
return mPhysicsTempDefaultHeap;

[RobbyV2]

Done. The two guards are folded into one condition because the split form does not match.