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KernelGen - remove leftover legacy include not used anymore and add <math.h> missing one when used as standalone

fixed a severe bug when using the limiter plus generic kernels: dg2fv projector array needs to be initialized with zero!
(Previous commit added the wrong file)

fixed a severe bug when using the limiter plus generic kernels: dg2fv projector array needs to be initialized with zero!

KernelGen - fix time iteration in CK: remove unused n+1th derivative in default and compute only order derivative (0th derivative is given) in splitCK intead of nDof

KernelGen - Use Python's Decimal instead of float in MathUtils, DGMatrices + Quadrature generated with 40 decimal places instead of 15

KernelGen - refactor call to LIBXSMM through a gemmsGeneratorModel + remove access to controller in models

KernelGen SplitCK - add missing pragma simd if multiplyMatPar is used (the compiler should already have used SIMD but just to be consistent)

Jm/aosoa2

See merge request exahype/ExaHyPE-Engine!40

KernelGen SplitCK Vect - remove tmpArray + add vectorization to extrapolator using omp simd reduction in x (faster than gather/scatter)