vector refactor
	modified:   stigame/ISprite.cpp
	modified:   stigame/ISprite.h
	modified:   stigame/MathTK.cpp
	modified:   stigame/Sprite.h
	modified:   stigame/StiGame.cbp
	new file:   stigame/Vector.cpp
	new file:   stigame/Vector.h
	modified:   stiuniverse/SpaceVessel.cpp
	modified:   stiuniverse/main.cpp
deleted svector
	deleted:    stigame/SVector.cpp
	deleted:    stigame/SVector.h