Simplify registration of builtin functions (a lot!)

src/language/modules/BuiltinModule.hpp

src/language/modules/CoreModule.cpp

src/language/modules/DevUtilsModule.cpp

src/language/modules/LinearSolverModule.cpp

src/language/modules/MathFunctionRegisterForVh.cpp

src/language/modules/MathModule.cpp

src/language/modules/MeshModule.cpp

src/language/modules/SchemeModule.cpp

src/language/modules/SocketModule.cpp

src/language/modules/WriterModule.cpp

tests/test_BuiltinFunctionEmbedder.cpp

tests/test_BuiltinFunctionEmbedderTable.cpp