Updated layout of About page
Updated InfoPopup to match look of system notifications
Finished the user interface for loading databases

- Fixed a bug in text fields loosing focus when th eye icon was clicked
- Added dropbox location to creating and opening a database
- Added functionality to "Open automatically" button on the password query page, now the last used database will be opened by default. Setting can be unselected in password query page.
- Recent list of databases is now saved in settings. Up to 5 recent databases are now available in the list on main page
- Settings are now not stored any more in a local storage (sqlite DB) but by means of QSettings in a ini file. The settings handling code was moved to C++ side which cleans up the QML code enourmously :)