Suppress stdout newlines, fix transformations.

Add:
	lib/mdl.l
		-Suppress the newlines that `flex`'s `yyparse()` prints to `stdout` by
		adding a newline to the default regex match.

Fix:
	src/interpreter/interpreter.c
		-Transformations were being incorrectly handled. The interpreter
		multiplied new transformation matrices into the top of the stack,
		instead of multiplying the top of the stack into new transformation
		matrices and then replacing it with the newly created matrix.