Dynamic Mesh Refinement with Multiple Cells

Dynamic mesh refinement and structural rearrangement with multiple cells
Mesh refinement is now working with multiple cells. This model here operates in real-time and consists of four cells (compartments) with surface tension and pressure forces.
The implementation paper will focus more on single cell membrane coupled chemical and mechanical processes, but I wanted to make absolutely sure the mesh data structure works correctly with multiple cells. Multi-cells are the ultimate goal here, and everything about this data structure is optimized for this goal.