Allow affiliations to carry project ownership information; transform profile
images correctly

Summary:
This is sort of doing two things at once:

• Add an "isOwner" flag to Project Affiliation to lay the groundwork for T237.
• Rename the "QuickCreate" workflow to "Create" and funnel all creation

through it.

• Reorganize the image transformation stuff and use it to correctly

crop/resize uploaded images.

Test Plan:
Created and edited projects and affailiations. Uploaded project, user, and
profile photos. Verified existing thumbnailing in Maniphest still works
properly.

Reviewed By: cadamo
Reviewers: cadamo, aran, jungejason, tuomaspelkonen
CC: aran, epriestley, cadamo
Differential Revision: 529