Add ability to navigate fields using keyboard

[MaKleSoft]

In Padlock 1.x it was possible to navigate record fields using the arrow keys and quickly copy values using cmd/ctrl + c. This functionality should be reimplemented for 2.x.

[combinatorist]

These details are probably obvious to everyone, but I just wanted to make them explicit.

Right now, using the keyboard alone I'm able to (with Mac commands):

• open padlock, (CMD + space)
• enter my master password (just type it),
• find my the record I want (CMD + "f", start typing record name, arrow down to my record)
• select that record and see the view of it (hit enter)

At that point, all I want to do is switch form the search pane on the left to the record view pane on the right. On the desktop, it would be intuitive to use a right arrow to switch panes. But, it would be even better to get a shorter path overall. I think about ~75% of the time my username is already saved on the website I want to use and I just need the password, but it would be great to keyboard to the username and custom fields as well.

[probablykasper]

Tabbing doesn't seem to work at all, and it would be great to have more menubar items