Update Usermod Battery (#2975)

* auto-off feature and usermod rename
* low-power-indicator, voltage fine tuning, clean-up

* corrected small mistakes
* Bugfixes, added usermod logo, update readme
* minor changes, implemented change requests, optimizationz

wled00/usermods_list.cpp

@@ -11,8 +11,8 @@
  */
 //#include "../usermods/EXAMPLE_v2/usermod_v2_example.h"
 
-#ifdef USERMOD_BATTERY_STATUS_BASIC
-  #include "../usermods/battery_status_basic/usermod_v2_battery_status_basic.h"
+#ifdef USERMOD_BATTERY
+  #include "../usermods/battery/usermod_v2_battery.h"
 #endif
 
 #ifdef USERMOD_DALLASTEMPERATURE
@@ -193,8 +193,8 @@ void registerUsermods()
    * \/ \/ \/
    */
   //usermods.add(new MyExampleUsermod());
-  #ifdef USERMOD_BATTERY_STATUS_BASIC
-  usermods.add(new UsermodBatteryBasic());
+  #ifdef USERMOD_BATTERY
+  usermods.add(new UsermodBattery());
   #endif
   
   #ifdef USERMOD_DALLASTEMPERATURE