[WIP] pywrapper - custom source terms for all solvers #8156

Job	Run time
Build SU2 (BaseMPI)	12m 58s
Build SU2 (asan) (BaseNoMPI-asan)	15m 36s
Build SU2 (ReverseMPI)	6m 52s
Build SU2 (asan) (ReverseNoMPI-asan)	14m 39s
Build SU2 (ForwardMPI)	3m 47s
Build SU2 (BaseNoMPI)	7m 35s
Build SU2 (ReverseNoMPI)	6m 7s
Build SU2 (tsan) (BaseOMP-tsan)	12m 4s
Build SU2 (ForwardNoMPI)	5m 15s
Build SU2 (tsan) (ReverseOMP-tsan)	11m 30s
Build SU2 (BaseOMP)	7m 58s
Build SU2 (ReverseOMP)	6m 8s
Build SU2 (ForwardOMP)	5m 14s
Thread Sanitizer Tests	0s
Regression Tests	0s
Unit Tests	0s
Address Sanitizer Tests	0s
	1h 55m 43s

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