Organizer: Auto Update Programs

closes #297 (closed) closes #299 (closed)

open tasks from the last meeting (14.10.2020)

• why are program lessons not deleted (orphaned lessons) in configuration when deleting a single program? (@rapl42 the function was simply not transferred to the abstract static class and not called, see line 385 in o_utility_functions.dart)
• add a new line in json file (can't do it, robert)
• cleanup ChangeListTile
• i18n row 265 -> history page
• outsource debug functions in history page
• remopheOrphanedNotifications -> Util Functions row 214 -> check why commented out
• check different context string separators
• context string behaviour
• HUGE BUG can't visit pools? surfaceDestroyed callback.size 1 #2 io.flutter.embedding.android.FlutterSurfaceView, was due to "Expanded" in the Stack @ poolconfigpage