Multiple printers (#85)

* screen/printer_select/splash_screen: Updates to allow changing between moonraker instances

* Updates to multiple printers

* settings: Display printer endpoints

* Update macros to be on a per-printer basis

* files: Changes to clear out file cache on printer switch

* job_status: Redo page for action bar

* splash_screen: Change icon

* websocket: Actually close the websocket

* printer: Fix error case

* splash_screen: show buttons update

* readme update

ks_includes/KlippyWebsocket.py

@@ -75,6 +75,7 @@ class KlippyWebsocket(threading.Thread):
 
     def close(self):
         self.closing = True
+        self.ws.close()
 
     def is_connected(self):
         return self.connected