engine: CUDA engine lives reincarnated
cudasolver: compilation fix
cudasolver: header clean-up
cpusolver: use prev position in integration
math moved into solver. Make it header library
make eigenvalues calculation iteration contant
cpusolver: move utility functions to math.h
unify build system
gpusolver: add wall collisions
cudasolver: update
cpusolver: add same stiffness parameter for volume constraint
cudasolver: bring it in again