CHG: Reactivation of time.sleep for CPU idle

* Reactivation of time.sleep for CPU idle
** 200 ms delay for CPU idle and other processes
** Too long a delay will have a negative effect on the coin detection and the lockout relay
* Update time.sleep(0.1)
** Set CPU sleep time to 0,1 second. CPU workload then is 15%, thats fine. 0,2 s would be 10% and 0,01 would be 25-30%. Nothing would be 100%.

app.py

@@ -383,7 +383,10 @@ def coins_inserted():
 def monitor_coins_and_button():
     """Monitors coins inserted and buttons pushed
     """
-    # time.sleep(0.5)
+
+    # 200 ms sleep for CPU idle and other processes
+    time.sleep(0.1)
+    # Too long a delay will have a negative effect on the coin detection and the lockout relay
 
     #Wifi monitoring causes undesirable behavior sometimes.
     #ssid=check_connectivity()