Blender Mantaflow Integration: Single Code Fluid Solver

Liquids and smoke are both fluids and share properties. It therefore makes sense to have one single fluid solver in Blender which handles all fluid simulations.

In this project I plan to add liquid simulations to the existing Mantaflow (smoke) integration. More specifically, I would like to achieve the same functionality from the Elbeem code base with Mantaflow. Besides smaller Mantaflow specific features, the novel NB FLIP will be implemented as well.