Added time-out timer

You can choose for off, 15m, 30m, 60m and 90m.
Timer will reset everytime you use a button or the rotary.
Radio will go in full deep-sleep, including the processor.
To wake up, just jiggle the knob.

src/gui.h

@@ -52,7 +52,6 @@ extern bool rdsreset;
 extern bool RDSstatus;
 extern bool RDSstatusold;
 extern bool rdsstereoold;
-extern byte showrdserrors;
 extern bool showsquelch;
 extern bool softmuteam;
 extern bool softmutefm;
@@ -99,6 +98,7 @@ extern byte screensaverOptions[5];
 extern byte screensaverset;
 extern byte showmodulation;
 extern byte showSWMIBand;
+extern byte showrdserrors;
 extern byte stationlistid;
 extern int8_t CNold;
 extern byte StereoLevel;
@@ -106,6 +106,7 @@ extern byte StereoLevel;
 extern byte submenu;
 extern byte subnetclient;
 extern byte theme;
+extern byte tot;
 extern byte touchrotating;
 extern byte unit;
 extern char programTypePrevious[18];