Release 2.2.0

- Added YubiKey 2FA integration for unlocking databases [#127]
- Added TOTP support [#519]
- Added CSV import tool [#146, #490]
- Added KeePassXC CLI tool [#254]
- Added diceware password generator [#373]
- Added support for entry references [#370, #378]
- Added support for Twofish encryption [#167]
- Enabled DEP and ASLR for in-memory protection [#371]
- Enabled single instance mode [#510]
- Enabled portable mode [#645]
- Enabled database lock on screensaver and session lock [#545]
- Redesigned welcome screen with common features and recent databases [#292]
- Multiple updates to search behavior [#168, #213, #374, #471, #603, #654]
- Added auto-type fields {CLEARFIELD}, {SPACE}, {{}, {}} [#267, #427, #480]
- Fixed auto-type errors on Linux [#550]
- Prompt user prior to executing a cmd:// URL [#235]
- Entry attributes can be protected (hidden) [#220]
- Added extended ascii to password generator [#538]
- Added new database icon to toolbar [#289]
- Added context menu entry to empty recycle bin in databases [#520]
- Added "apply" button to entry and group edit windows [#624]
- Added macOS tray icon and enabled minimize on close [#583]
- Fixed issues with unclean shutdowns [#170, #580]
- Changed keyboard shortcut to create new database to CTRL+SHIFT+N [#515]
- Compare window title to entry URLs [#556]
- Implemented inline error messages [#162]
- Ignore group expansion and other minor changes when making database "dirty" [#464]
- Updated license and copyright information on souce files [#632]
- Added contributors list to about dialog [#629]