support for battery if any + TPMS app to ext (#2129)

* batt initial
* batt widgets
* settings modify
* batt info screen
* ability to hide icon
* battView
* redo tmps
* hide curr + charge if no data
* fix flashing

firmware/common/message.hpp

@@ -123,6 +123,7 @@ class Message {
         EnvironmentData = 65,
         AudioBeep = 66,
         PocsagTosend = 67,
+        BatteryStateData = 68,
         MAX
     };
 
@@ -1409,4 +1410,20 @@ class PocsagTosendMessage : public Message {
     uint64_t addr = 0;
 };
 
+class BatteryStateMessage : public Message {
+   public:
+    constexpr BatteryStateMessage(
+        uint8_t percent,
+        bool on_charger,
+        uint16_t voltage)
+        : Message{ID::BatteryStateData},
+          percent{percent},
+          on_charger{on_charger},
+          voltage{voltage} {
+    }
+    uint8_t percent = 0;
+    bool on_charger = false;
+    uint16_t voltage = 0;  // mV
+};
+
 #endif /*__MESSAGE_H__*/