Implemented profiling capabilities

CMakeLists.txt

include/common/gpu_support.hpp

include/maxwell/maxwell_interface.h

include/timecounter.h

src/CMakeLists.txt

src/libgmshdg/CMakeLists.txt

src/libgmshdg/timecounter.cpp

src/maxwell/maxwell_gpu.cpp

tests/test_curl.cpp

tests/test_differentiation.cpp

tests/test_lifting.cpp