Add TBathtub and add stubs for functions

[TheAzack9]

I am unsure what conventions are here, for me this feels like TBathtub could've been in a separate file. However from symbols it hints that it should be in MapObjCorona. 🤔 Been a while so i forgot, so please yell if i should move it.

[decomp-dev]

Report for GMSJ01 (0d49c4b - 64d07f6)

📈 Matched code: 24.97% (+0.00%, +140 bytes)

✅ 2 new matches

Unit	Function	Bytes	Before	After
mario/MoveBG/MapObjCorona	TBathtub::~TBathtub()	+132	0.00%	100.00%
mario/MoveBG/MapObjCorona	@32@__dt__8TBathtubFv	+8	0.00%	100.00%

📈 27 improvements in unmatched functions

Unit	Function	Bytes	Before	After
mario/MoveBG/MapObjCorona	TBathtub::TBathtub(const char*)	+32	0.00%	13.33%
mario/MoveBG/MapObjCorona	TBathtub::isKillerAttackable() const	+4	0.00%	14.29%
mario/MoveBG/MapObjCorona	TBathtub::getNextGrip(const JGeometry::TVec3<float>&, const JGeometry::TVec3<float>&, float, float*) const	+4	0.00%	0.68%
mario/MoveBG/MapObjCorona	TBathtub::getNextJuncture(const JGeometry::TVec3<float>&, const JGeometry::TVec3<float>&) const	+4	0.00%	0.69%
mario/MoveBG/MapObjCorona	TBathtub::perform(unsigned long, JDrama::TGraphics*)	+4	0.00%	0.50%
mario/MoveBG/MapObjCorona	TBathtub::getRootJointMtx() const	+4	0.00%	6.67%
mario/MoveBG/MapObjCorona	TBathtub::receiveMessage(THitActor*, unsigned long)	+4	0.00%	2.08%
mario/MoveBG/MapObjCorona	TBathtub::getKoopaJrMtxInDemo()	+4	0.00%	14.29%
mario/MoveBG/MapObjCorona	TBathtub::getPeachMtxInDemo()	+4	0.00%	14.29%
mario/MoveBG/MapObjCorona	TBathtub::getSubmarineMtxInDemo()	+4	0.00%	14.29%
mario/MoveBG/MapObjCorona	TBathtub::getTakingMtx()	+4	0.00%	14.29%
mario/MoveBG/MapObjCorona	TBathtub::getNumKillerBurstable() const	+3	0.00%	0.93%
mario/MoveBG/MapObjCorona	TBathtub::getNumKillerLaunchable() const	+3	0.00%	1.23%
mario/MoveBG/MapObjCorona	TBathtub::load(JSUMemoryInputStream&)	+3	0.00%	0.32%
mario/MoveBG/MapObjCorona	TBathtub::updatePosture_()	+3	0.00%	0.26%
mario/MoveBG/MapObjCorona	TBathtub::getNearGrip(const JGeometry::TVec3<float>&, float, float*) const	+3	0.00%	0.87%
mario/MoveBG/MapObjCorona	TBathtub::calcRootMatrix()	+3	0.00%	1.30%
mario/MoveBG/MapObjCorona	TBathtub::allowsTumble() const	+3	0.00%	0.65%
mario/MoveBG/MapObjCorona	TBathtub::startDemo()	+3	0.00%	0.60%
mario/MoveBG/MapObjCorona	TBathtub::setupCollisions_()	+3	0.00%	0.34%
mario/MoveBG/MapObjCorona	TBathtub::calcBathtubData()	+3	0.00%	0.42%
mario/MoveBG/MapObjCorona	TBathtub::control()	+3	0.00%	0.33%
mario/MoveBG/MapObjCorona	TBathtub::tumble(float, float)	+3	0.00%	2.94%
mario/MoveBG/MapObjCorona	TBathtub::getNumGripsDead() const	+3	0.00%	3.03%
mario/MoveBG/MapObjCorona	TBathtub::quake(const JGeometry::TVec3<float>&)	+3	0.00%	1.27%
mario/MoveBG/MapObjCorona	TBathtub::hipdrop(const JGeometry::TVec3<float>&)	+3	0.00%	1.75%
mario/MoveBG/MapObjCorona	TBathtub::loadAfter()	+3	0.00%	1.64%