Bug in Mixer when offset used with a switch + slow down

GPS displayed as ---- when there has no fixed received since beginning
No Custom telemetry screen displayed when nothing to display
Marks at -100 and +100 when editing a value
RSSI alarms 1 + 2 labels were wrong
ANAS menu redesigned
60 models on ersky9x board
Current calibration on ersky9x board

src/simpgmspace.cpp

@@ -213,6 +213,11 @@ void eeprom_read_block (void *pointer_ram,
   }
 }
 
+uint16_t stack_free()
+{
+  return 500;
+}
+
 #if 0
 static void EeFsDump(){
   for(int i=0; i<EESIZE; i++)