WIP: Much UI awesomeness

Fixes #89, #88, #85, #75, #73, #43, #41, #34.

@pdehaan r?
This intrigues my eyes.
Is "Lost Mode" **always** a 2 step process? If I already have a lock code specified on mein device, does it need/use the second step, or is it strictly _"set note and [lock device]"_ vs _"set note, set passcode and [lock device]"_?