ve.Element refactor

Objectives:

* Move ve.ui.Element to ve.Element
* Make CE nodes inherit from ve.Element

Changes:

ve.ui.Element.js, ve.Element.js
* Move and rename
* Move ve.ui.get$$ to ve.Element.static.get$$
* Add static getDocument and getWindow methods
* Add instance getElementDocument and getElementWindow methods
* Add getTagName method, which by default reads the static tagName property, but when overridden can return a tag name based on other factors

*.php
* Updated file link

ve.ce.*Annotation.js, ve.ce.*Node.js, ve.ce.View.js, ve.ce.Document
* Added config options pass through
* Replaced passing elements through constructor with defining static tag names
* Added getTagName overrides where needed that derive tag name from model
* Refactore dom wrapper methods, now consistently using getTagName

ve.ce.Surface.js
* Removed static initialization (not needed)

ve.dm.Model.js, ve.ui.Window.js
* Added missing docs

ve.ui.GroupElement.js, ve.ui.Layout.js, ve.ui.Widget.js,
* Updated class name for elements

ve.ui.Frame.js, ve.ui.LookupInputWidget.js
* Updated location of get$$

ve.ui.js
* Move get$$ to ve.Element

ve.js
* Add auto-init of static properties to mixinClass

Change-Id: I39ae14966456903728e4d9e53f806ddce9ca2b70
Merge "ve.Element refactor"