Make Drydock Lease and Resource PHIDs use newer PHID infrastructure

Summary:
Ref T2015. These never got updated to the new stuff, move them out of the old Constants class and let them load handles, etc.

Also some half-cleanup of some Blueprint/BlueprintImplementation stuff.

Test Plan: Used phid.query to query a Resource, Lease, and Blueprint.

Reviewers: btrahan

Reviewed By: btrahan

CC: hach-que, aran

Maniphest Tasks: T2015

Differential Revision: https://secure.phabricator.com/D7828