Improve naming of classes and replace order by degree for clarity

src/analysis/CMakeLists.txt

src/analysis/QuadratureFormula.hpp

src/analysis/SimplicialGaussQuadrature.cpp

src/analysis/SimplicialGaussQuadrature.hpp

src/analysis/TensorialGaussLegendreQuadrature.cpp

src/analysis/TensorialGaussLegendreQuadrature.hpp

src/analysis/TensorialGaussLobattoQuadrature.cpp

src/analysis/TensorialGaussLobattoQuadrature.hpp

tests/CMakeLists.txt

tests/test_SimplicialGaussQuadrature.cpp

tests/test_TensorialGaussLegendreQuadrature.cpp

tests/test_TensorialGaussLobattoQuadrature.cpp