Update and finish listener implementation

[mschatten]

Listener currently handles only channel input and output templates. The rest of the syntax (which has been updated a bit and shall be addtionally updated in #19 #20 #21 #22 and #23) should be connected to the core system (after being updated).

APi/listener.py

Lines 8 to 11 in e1208c0

	class APi( APiListener ):
	'''
	APi main listener.
	'''