This allows `t:word` instead of `title:word` and `p:word` instead of `password:word`, and so on. The rule is that an abbreviated name expands to the first field name that starts with it, with exceptions
`u:` expanding to `username:` instead of `url:` and `pw:` expanding to `password:`.
* DatabaseTabWidget::newDatabase returns the created DatabaseWidget
* Emit DatabaseTabWidget::databaseOpened signal before a new tab is added
* EntrySearcher can now search attribute values including custom ones
* Add Group::applyGroupIconTo to set the group icon on the supplied entry
* Implement desktop notifications through the system tray icon
* Add DatabaseWidget::deleteEntries to delete a list of entries
* Add Aes128 in SymmetricCipher::algorithmIvSize
* Add DatabaseWidget::databaseReplaced signal
* Add a helper class to override the message box's parent (prevent bugs)
