Added several view controllers, and lift model.

Assistance lifts are now ordered on create.

Added updating to edit lift view controller.

Custom lifts now reload on view appear, and right aligned edit inputs.

Fleshed out custom workout view.

Added model and store

Made custom assistance workout data match fto lifts.

Wired custom workout view controller. Need to implement.

Wired more views. Added stub test to implement.
Fixed Migrate2to3 to handle custom assistance