dt_ctrl

Untill now, connecting e.g. a 'bool' output to a 'float' input would give:

 ERROR: Input terminal x.y not found

.. although both the input and the output existed.
With this commit, the error will read :

 ERROR: Type mismatch. Can't connect output terminal a.b (of type 'bool') to
 input terminal x.y (of type 'float')

	modified:   controller/controller_block.c
	modified:   controller/controller_block.h