Triple GPS state (#3157)

* Triple state GPS refactoring

* Skip probe

* Move GPS toggle into the GPSThread

* Consolidate

* make all happy (including me)

* corrected screen texts

* NOT_PRESENT guard in main.cpp

---------

Co-authored-by: mverch67 <manuel.verch@gmx.de>

src/gps/GPS.h

@@ -133,6 +133,9 @@ class GPS : private concurrency::OSThread
     // Disable the thread
     int32_t disable() override;
 
+    // toggle between enabled/disabled
+    void toggleGpsMode();
+
     void setGPSPower(bool on, bool standbyOnly, uint32_t sleepTime);
 
     /// Returns true if we have acquired GPS lock.
@@ -144,7 +147,7 @@ class GPS : private concurrency::OSThread
     /// Return true if we are connected to a GPS
     bool isConnected() const { return hasGPS; }
 
-    bool isPowerSaving() const { return !config.position.gps_enabled; }
+    bool isPowerSaving() const { return config.position.gps_mode != meshtastic_Config_PositionConfig_GpsMode_ENABLED; }
 
     // Empty the input buffer as quickly as possible
     void clearBuffer();