Compare objects/arrays fix

Objectives:

* Fix compareObjects so it doesn't break when given arrays
* Remove compareArrays
* Rename compareObjects to compare and update callers of both methods

Changes:

ve.js
* Loosen check for whether to recurse so both arrays and objects qualify
* Remove compareArrays
* Rename compareObjects to compare

ve.dm.MWTemplateNode.js, ve.dm.AnnotationSet.js, ve.dm.Document.js,
ve.dm.Transaction.js
* Update uses of compare(Arrays|Objects) to use compare

Change-Id: I7d4f7ceb28c0389f0157b7598e291f21393b5b85