(bug 43841) Major ve.ui rewrite, especially ve.ui.LinkInspector

Objectives:

* Make the link inspector easier to use
* Try to resolve a few bugs (bug 43841, bug 43063, bug 42986)
* Stop using jquery.multiSuggest (which didn't really understand annotations)
* Better divide MediaWiki specifics from generic implementations

Changes:

VisualEditor.php, modules/ve/test/index.php, demos/ve/index.php
* Updated links to files

ve.Registry
* Fixed mistake where registry was initialized as an array - this didn't cause any errors because you can add arbitrary properties to an array and use it like any other object

ve.Factory
* Removed duplicate initialization of registry property
* Added entries property, which is an array that's appended to for tracking the order of registrations

ve.CommandRegistry
* Added mwLink command which opens the mwLink inspector

ve.ui.TextInputWidget
* Added basic widget class for text inputs

ve.ui.TextInputMenuWidget
* Added widget that provides a menu of options for a text input widget

ve.ui.MWLinkTargetInputWidget
* Added MediaWiki specific link target widget

ve.ui.MenuWidget
* Converted ve.ui.Menu into a widget
* Moved the body of onSelect to onMouseUp

ve.ui.LinkTargetInputWidget
* Added link target widget which adds link annotation functionality to a normal text input

ve.ui.InputWidget
* Added generic input widget which emits reliable and instant change events and synchronizes a value property with the DOM value

ve.ui.Widget
* Added base widget class
* Widgets can be used in any frame

ve.ui.Tool
* Fixed line length issues

ve.ui.InspectorFactory
* Made use of new entries property for factories to select the most recently added inspector if more than one match a given annotation

ve.ui.Inspector
* Added auto-focus on the first visible input element on open
* Moved afterClose event to after re-focus on document on close
* Added documentation

ve.ui.Frame
* Adjusted documentation
* Added binding of $$ to the frame context so it can be passed around
* Added documentation

ve.ui.Context
* Added ve.ui.Widget.css to iframes
* Updated code as per moving of ve.ui.Menu to ve.ui.MenuWidget
* Removed unused positionBelowOverlay method
* Added CSS settings to set overlay left and width properties according to context size
* Added documentation

ve.ui.DropdownTool
* Updated code as per moving of ve.ui.Menu to ve.ui.MenuWidget

ve.ui.FormatDropdownTool
* Added documentation

ve.ui.MWLinkButtonTool
* Added MediaWiki specific version of ve.ui.LinkButtonTool, which opens the mwLink inspector

ve.ui.Widget.css
* Added styles for all widgets

ve.ui.Tool.css, ve.init.sa.css, ve.init.mw.ViewPageTarget.css, ve.init.mw.ViewPageTarget-apex.css
* Updated code as per moving of ve.ui.Menu to ve.ui.MenuWidget

ve.ui.Menu.css
* Deleted (merged into ve.ui.Widget.css)

ve.ui.Menu.css
* Deleted suggest styles (no longer used)

pending.gif, pending.psd
* Added diagonal stripe animation to indicate a pending request to the API

ve.ui.MWLinkInspector
* Added MediaWiki specific inspector which uses MediaWiki specific annotations and widgets

ve.ui.LinkInspector
* Removed mw global hint (not needed anymore)
* Switched from comparing targets to annotations (since the target text is ambiguous in some situations)
* Switched to using input widget, which is configured using a static property
* Removed use of jquery.multiSuggest
* Moved MediaWiki specifics to their own class (ve.ui.MWLinkInspector)

ve.init.mw.ViewPageTarget
* Added MediaWiki specific toolbar and command options

Change-Id: I859b5871a9d2f17d970c002067c8ff24f3513e9f