BaseUI: First attempt at Ham Mode implementation (#10663)

* First attempt at Ham Mode implementation

* Simplify licensedOnly check

* Move related code closer together

* TX Disabled if N0CALL, enabled if properly set

* Only disable if callsign is N0CALL, don't enable at this stage.

* Allow users back to Normal mode if they don't pick an ITU region

src/modules/AdminModule.cpp

@@ -1463,6 +1463,10 @@ void AdminModule::handleSetHamMode(const meshtastic_HamParameters &p)
     }
     channels.onConfigChanged();
 
+    if (strcmp(p.call_sign, "N0CALL") == 0) {
+        config.lora.tx_enabled = false;
+    }
+
     service->reloadOwner(false);
     saveChanges(SEGMENT_CONFIG | SEGMENT_NODEDATABASE | SEGMENT_DEVICESTATE | SEGMENT_CHANNELS);
 }