- added keyboard shortcuts:
(Alt+1 = display popup; Alt+2 = enable/disable zoom; Alt+3 = display gallery/close gallery; Alt+4 = display favorites; Alt+5 = display options)
- added notifications for when feature is being used (english);
- minor tweaks;

- changed from storage.local to storage.sync
- added the zoom option in gallery
- small style changes
- fixed some bugs
- added enable/disable option

- Added a download button
- Added image display options for gallery and favorites

- improved styling
- repaired the favorite feature
- small fixes