Improve and fix parts of the inline editor widget.
This adds some improvements to the widget, making it more useful to

consumers. A consumer can now get the button elements without having to

look in the DOM, and can also get the editing state. This helps with

making intelligent decisions involving the editor.
To improve the apparent responsiveness, the buttons no longer fade

in/out. This was fine to have for a while, but removing animation makes

the editor feel more snappy.
The editor also now forwards 'resize' events from the contained field to

the editor's element. This lets consumers see when autoSizeTextArea, or

a custom widget, has changed sizes, in order to do more intelligent

layout updates.
There was a bug with fading the pencil back in after editing was

completed. It was trying to fade to an opacity of 100, but really, it

should have faded to an opacity of 1.0. It looked like the pencil was

just instantly showing, because it was.

Tested that the pencil faded back in noticeably when completing editing.
Tested that buttons instantly appeared/disappeared when editing/completing.
Made use of the new resize event and accessors in a change in Review Board.