* Fix focus issues with new PasswordWidget
* Fix focus wrapping when DatabaseTabWidget is not showing the tab bar
* Fix focus wrapping in EditWidget views to move between category list and contents. This is not a perfect fix, but Qt has a mind of its own with these complex widgets. This will be fixed in future Ui improvements that move away from the category widget.
Definitions:
* Database Key - Cryptographic hash used to perform encrypt/decrypt of the database.
* Database Credentials - User facing term to refer to the collection of Password, Key File, and/or Hardware Key used to derive the Database Key.
Changes:
* Remove the term "master" and "key" from the user's lexicon and clarify the code base based on the definitions above.
* Clean up wording in the UI to be clearer to the end user.
