Merge branch 'MC/high_order_geometry' into devel

CMakeLists.txt

include/libgmshdg/entity.h

include/libgmshdg/entity_data.h

include/libgmshdg/kernels_cpu.h

include/maxwell/maxwell_interface.h

share/examples/resonator/params_test_maxwell_resonator.lua

share/examples/resonator/resonator.geo

share/examples/resonator/resonator_cyl.geo

src/libgmshdg/entity.cpp

src/libgmshdg/physical_element.cpp

src/libgmshdg/reference_element.cpp

src/maxwell/maxwell_cpu.cpp

tests/test_differentiation.cpp

tests/test_lifting.cpp