Added LongText & DebugTickCounter
MainActivity: show calendar on date click
Toolbar fixes and refactor
Use GZip for import/export
Use GZip for save (and original file)
Added FeatureFlags
Added ColorHistoryManager to ItemEditor
New app icon for DEBUG version
Fix bug: filter group position
Fix bug: Copy UI break
big renames
ItemsStorage: add method addItem(Item item, int positionToAdd)
