Use ApplicationSearch for Releeph branch lists

Summary:
Releeph branch lists in project views have a bunch of custom UI right now; give them more standard UI and ApplicationSearch.

This drops a small piece of functionality: we now show only a total open request count instead of a detailed enumeration of each request status. I assume this is reasonable (that is, the important piece is "is there something to do on this branch?"), but we can muck with it if the more detailed status is important.

Test Plan: {F54344}

Reviewers: btrahan

Reviewed By: btrahan

CC: LegNeato, aran

Maniphest Tasks: T3656

Differential Revision: https://secure.phabricator.com/D6764
Modernize Releeph branch edit and create interfaces

Summary: Ref T3092. Fixes T3724. Use modern/flexible UI for these interfaces. Removes the ability to retarget an existing branch (you can just close it and open a new one if you made a mistake).

Test Plan: {F54437} {F54438}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T3092, T3724

Differential Revision: https://secure.phabricator.com/D6765