context menus bby

• added context menus for queue and explorer items (the future is now 😳). Now it's easier to view track details, open parent directory, clear queue and rearrange tracks
• removed (now useless) main menu options
• all new toasts will now appear instantly (no waiting for previous toasts to disappear)
• current dir path in main activity is now scrollable
• added album art dimensions in tag viewer
• sort "raw" tags alphabetically in tag viewer