AGI: Add heuristic to detect delay loops within scripts

And in that case poll events, delay for a few milliseconds and
update screen.
This somewhat worked before the graphics rewrite because of
a timer hack.
This one tries to detect actual inner loops.
Happens in at least Police Quest 1 when playing poker.

engines/agi/op_cmd.cpp

@@ -2327,6 +2327,9 @@ int AgiEngine::runLogic(int16 logicNr) {
 		}
 #endif
 
+		// Just a counter for every instruction, that got executed
+		_instructionCounter++;
+
 		_game.execStack.back().curIP = state->_curLogic->cIP;
 
 		char st[101];