[Parent issue] Edit entries

[sandysage]

When I have an incorrectly saved credential from Firefox (eg password but no username), I want the ability to refine that entry to be useful for me when I next go to log into that account.

Requirements

• Should provide the ability to edit from the entry detail view - Edit entry view and routing #628
• Should have ability to cancel the edits without confirmation if no changes made - Edit discard changes dialog #818
• Cancel should return the entry to the previous state (no way to save some edits and not others) - Edit discard changes dialog #818
• Should have to confirm cancelling when changes are made - Edit discard changes dialog #818
• Should display toast to confirm edit is saved (no designs yet) - Edit discard changes dialog #818
• Should serve appropriate error messages if the incorrect data is entered - Error states and field validation for edit #603

Related #603 (error states)