Merge branch 'fix/read-variable-size-matrices-and-optionals' into 'master'

...tion/codegenerator/codewriter/cpp/generator/Generator.cpp

...codegenerator/codewriter/cpp/generator/ndarray/Matrix.cpp

...erator/codewriter/cpp/generator/toplevel/IntEnumClass.cpp

...nerator/codewriter/cpp/generator/toplevel/ObjectClass.cpp

...obotAPI/libraries/aron/codegeneration/test/CMakeLists.txt

...libraries/aron/codegeneration/test/aronJsonExportTest.cpp

source/RobotAPI/libraries/aron/core/Exception.h

...braries/aron/core/codegeneration/cpp/AronGeneratedClass.h

...eader/nlohmannJSON/NlohmannJSONReaderWithoutTypeCheck.cpp

.../reader/nlohmannJSON/NlohmannJSONReaderWithoutTypeCheck.h