RTNeural

Made num_features_in static constexpr in

Tested non affine batchnorm2d and fix a bug there.

Added includes to Model.h, removed useless model.getNextInSize(), changed batchnorm to batchnorm2d in debug_print, added files to cmakelists, remove copy in batchnorm_eigen by using a map, all memory allocations in constructors, use resize instead of of push back. Single processModel function in conv2d_model.h

Added #if RTNEURAL_USE_EIGEN so other backend can compile. Removed multiple definition of TestType: only set in util_tests.hpp now

Merge pull request #2 from DamRsn/fix_conflicts