Improve pausing

when pausing the interpreter does not execute the stepRun, but the process is still running behind:

LRPInterpreter>>mainLoop
	[withLoop] whileTrue:[
		**pause** ifFalse: [self stepRun].
		self rate = 0 ifFalse:[(Delay forSeconds: 1/(self rate) asFloat)wait]. 
	]

It will be better if the process pauses too, Im not sure, but this should free some resources when the program is paused