Use Anchorage edge shorthand where possible

[ZevEisenberg]

verticalAnchors, horizontalAnchors, and edgeAnchors should all be used if possible.

[KingOfBrian]

Good idea! I think I may add an analysis pass after the CodeGenerators are populated in the XIBDocument. This could do the duplicate variable name detection, and coalesce ConstraintCodeGenerator to use the edge shorthands.

[KingOfBrian]

Should be able to follow a pattern like this to scan statements for 2 or 4 matching generators and replace them with the compound anchors.

https://github.com/Raizlabs/Eject/blob/master/EjectKit/Builder/ActionBuilder.swift#L37

[ZevEisenberg]

Now we have centerAnchors as well.