R1:123fdabb759a

Removed "PHID Types" storage object and interface components

Summary:
Removed because code wasn't used or really needed.

Test Plan:
* Tested that "PHID List" and "PHID Lookup" pages work correctly.
* Tested that new PHIDs can be allocated with the predefined set of types

Reviewed By: epriestley
Reviewers: epriestley
CC: epriestley
Differential Revision: 88