R1:488b1cf641d1

Allow Maniphest queries to be saved

Summary:
There have been a couple of requests for this since bookmarks are "out this year like woah" and "totally uncool dude".

Allow users to save named custom queries and make them the /maniphest/ default if they so desire.

A little messy. :/

Test Plan: Saved, edited, deleted custom queries. Made custom query default; made 'no default' default. Verified default behavior. Issued a modified search from a custom query.

Reviewers: btrahan

Reviewed By: btrahan

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