Re-added doxygen build.
Re-added doxygen build.

codingpoets/tigl,DLR-SC/tigl,DLR-SC/tigl,codingpoets/tigl,DLR-SC/tigl,codingpoets/tigl,codingpoets/tigl,DLR-SC/tigl,DLR-SC/tigl,codingpoets/tigl,DLR-SC/tigl,codingpoets/tigl