Provide more structure to PHUIObjectBoxView

Summary:
Three changes here.

• Add setActionList(), and use that to set the action list.
• Add setPropertyList(), and use that to set the property list.

These will let us add some apropriate CSS so we can fix the border issue, and get rid of a bunch of goofy .x + .y selectors.

• Replace addContent() with appendChild().

This is just a consistency thing; AphrontView already provides appendChild(), and addContent() did the same thing.

Test Plan:

• Viewed "All Config".
• Viewed a countdown.
• Viewed a revision (add comment, change list, table of contents, comment, local commits, open revisions affecting these files, update history).
• Viewed Diffusion (browse, change, history, repository, lint).
• Viewed Drydock (resource, lease).
• Viewed Files.
• Viewed Herald.
• Viewed Legalpad.
• Viewed macro (edit, edit audio, view).
• Viewed Maniphest.
• Viewed Applications.
• Viewed Paste.
• Viewed People.
• Viewed Phulux.
• Viewed Pholio.
• Viewed Phame (blog, post).
• Viewed Phortune (account, product).
• Viewed Ponder (questions, answers, comments).
• Viewed Releeph.
• Viewed Projects.
• Viewed Slowvote.

Reviewers: chad

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D7174