Make battery reading periodic. Add events. Disable pullup

src/displayapp/DisplayApp.cpp

@@ -194,9 +194,6 @@ void DisplayApp::Refresh() {
         //        clockScreen.SetBleConnectionState(bleController.IsConnected() ? Screens::Clock::BleConnectionStates::Connected :
         //        Screens::Clock::BleConnectionStates::NotConnected);
         break;
-      case Messages::UpdateBatteryLevel:
-        batteryController.Update();
-        break;
       case Messages::NewNotification:
         LoadApp(Apps::NotificationsPreview, DisplayApp::FullRefreshDirections::Down);
         break;

src/displayapp/Messages.h

@@ -7,7 +7,6 @@ namespace Pinetime {
         GoToRunning,
         UpdateDateTime,
         UpdateBleConnection,
-        UpdateBatteryLevel,
         TouchEvent,
         ButtonPushed,
         NewNotification,

src/displayapp/screens/BatteryInfo.cpp

@@ -59,9 +59,6 @@ BatteryInfo::~BatteryInfo() {
 }
 
 void BatteryInfo::UpdateScreen() {
-
-  batteryController.Update();
-
   batteryPercent = batteryController.PercentRemaining();
   batteryVoltage = batteryController.Voltage();