updates to surface tension model
finalize mass penalization and add new leftType
There are some issues with the code
Drucker-Prager with cap has been added to the Micromorphic element
MicroGradient plasticity has been completed
MicrogradientPlasticity is working but convergence is linear
MicroGradientPlasticity is working but convergence is linear
various left types of shock wave
remove volume fraction
simu types: remove particles, calculate mass percentage
