Merge "Profile" and "Account" settings panels

Summary: There are only a total of three options now, merge them into a single panel.

Test Plan:
Set all the settings.

{F49406}

Reviewers: btrahan, chad

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D6400
Merge profile "About" into main profile and simplify some custom field stuff

Summary:
Ref T1703. Drive "user since" with a custom field and make the other fields render into a property list.

Users can make their profiles a little more personal/obnoxious now.

Also delete a bunch of code.

Test Plan: {F49415}

Reviewers: chad, btrahan

Reviewed By: chad

CC: aran

Maniphest Tasks: T1703

Differential Revision: https://secure.phabricator.com/D6401
Use tags to show user status

Summary: I'll probably move "away" to a custom field, but this is technically broken right now.

Test Plan: {F49416}

Reviewers: chad, btrahan

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D6402
Use ActionListView for all profile actions

Summary:
This leaves the space between the properties and the blurb looking a bit empty, but there will be more stuff there soon (status, VCS names, email, phone/fax numbers, etc., and custom user fields).

I removed "view lint messages" since I'm pretty sure no one has ever clicked it. I think providing better search (e.g, T2625) to that UI in Diffusion is a preferable approach.

Test Plan: {F49423}

Reviewers: chad, btrahan

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D6403