Don't crash when you delete a password manager entry that is your only one and you are editing the password

Having merged in the PR for selecting an account after opening the password manager from a trigger, add manual retain-release code and rename ivar.

If no local authentication policy can succeed, then authenticate the password manager. This is the previous behavior from 3.1.1. Apparently OS X 10.11 has the APIs but can't authenticate with them. Issue 6113

We should not have requested biometric authentication, since device owner
authentication includes biometric. Device owner is better because it gives
you the option of using password auth (e.g., if your laptop is closed).

Add a context menu to the password manager with a Reveal Password item. Double click always sends the password now. Issue 5912.

Keep another app from becoming active after local auth dialog from pw manager sheet attached to hotkey window is dismissed.

Fix a hang when hiding a hotkey window that has sheets (was using deprecated API)

Issue 5860

If no local auth policies can succeed, consider yourself authenticated. Fixes a problem where the password manager doesn't work on mac os 10.11. Issue 5553.

Add support for local authentication services using touch ID if possible when opening the password manager, once per invocation

Make a double click on the first column of the password manager's table send the password. Issue 4639.

Use DEPRECATED_ATTRIBUTE to mark functions deprecated in the comments.

Add an Edit Password button to the password manager. Helps accessibility and makes it easier to use in general. Issue 3694

Show password manager as a sheet in each window, or as a standalone window if there are no terminal windows. Properly handle it as a sheet in the hotkey window.

Move source into sources/ directory. Delete a few unused images in the process and fix a reference to an Aqua image in FindView