Convert inline profile image transforms to new transformations

Summary:
Ref T7707. Fixes T7879. Fixes T4406. When creating profile images:

• Use the new transforms;
• mark them as "profile" images so they're forced to the most-open policies.

Test Plan:

• Set restrictive default file policies.
• Changed profile picture, project pictures, etc. Verified they were visible to logged-out users.
• Registered via OAuth.
• Updated a Conpherence thread image.
• Browsed around looking for profile images, fixed sizing on everything I could find.

Reviewers: chad, btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7879, T7707, T4406

Differential Revision: https://secure.phabricator.com/D12821