tinyphysicsengine/old

WIP

NOTE to self and other: This probably isn't gonna work, 32bit fixed point has showed to be too low precision for a 3D physics engine (even though it is enough for 3D rendering). The issue is that we need to represent both very high and very low energies so we can allocate about 9 bits to the fractional part of the number, however this is too little to deal with slow rotations and low energies; it happens too often that for example objects balance on their edges because their energy gets quite small and rounded to zero. The project probably needs to be rewritten from scratch with more precision (still wouldn't use floating point but rather some tiny custon fixed point library).