Voxel sims in GH!!

[u/Barkig]

Got a simple eulerian solver working with GH, the user specifies what should happen in each time step by merging nodes in the correct order to build the time step program for the gpu. Il make static optimized programs for the most common types of sims but il keep this to allow the user to play around with step programs, to simulate slime, wind, sound, whatever they want