Add #row_major matrix[R, C]T

As well as `#column_major matrix[R, C]T` as an alias for just `matrix[R, C]T`.
This is because some libraries require a row_major internal layout but still want to be used with row or major oriented vectors.

src/parser.hpp

@@ -772,6 +772,7 @@ AST_KIND(_TypeBegin, "", bool) \
 		Ast *row_count;    \
 		Ast *column_count; \
 		Ast *elem;         \
+		bool is_row_major; \
 	}) \
 AST_KIND(_TypeEnd,  "", bool)