Changes:
- #215: [Feature] Main Menu Loading icon and fix warning / clean code
- #207: [Feature] Clear internal icon cache if too big
- #206: [Feature] Settings - Add button to open root folder
- #204: [Feature] Improved performance
- #69: [Feature] Mouse disturbing while using keys
- #214: [BUG] Rare flickering in darkmode and open same item several times
- #213: [BUG] NullReferenceException when missing default browser
- #209: [BUG] Icons of shortcuts not displayed correctly