Experimental/kotlin

• [THFMA-27] [THFMA-25] Add initial widget and new navigation

  • Adds new drawer style menu on the left for future features
  • Adds basis of a widget

• [THFMA-27] [THFMA-24] Finish widget code for first test

  • Widget 90% capable
    • Song info gets updated from service
    • Widget can play/pause and launch main activity
  • Making the code a bit more nullptr safe by initializing more things explicitly