Fixed memory leaks and updated functionality

- Made a self parsing function inside anime entity
- Added clear database function and patched up memory leak
- Added clear model function
- Added clear queue function
- Added sync function inside queue manager
- Changing username in settings will clear the database, model and queue
and will start fetching data for the new username
- Fixed bug in settings dialog where it won't auto sync user if they
typed in a different password
- Queue file is now saved in the user's directory Data/Users/<user>
- Increased font size to 9