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Rework force models and central moments transform

Merged Markus Holzer requested to merge holzer/lbmpy:ShiftMatrix into master

This MR provides a complete rework of the force model, so they are functioning in the moment space and the central moment space.

Furthermore, a new implementation for the shift matrix is provided and a rework of the central moment based method.

The central moment transform classes are adapted to be able to work with the changes.

TODOs:

  • Test Fixed Density BC when method has a force model
  • Forward/Backward Transform for D3Q15
  • make cumulants aware of polynomials
  • rework cumulants with force
Edited by Markus Holzer