[meta] Clean up/improve consistency of Edit

Updated issue summary.

Updated issue summary.

Updated issue summary.

Updated issue summary.

Updated issue summary.

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#1979784: Factor Create.js and VIE.js out of the Edit module got committed, we can now work on this. I'll work on this after DrupalCon.

This is now blocked on #1678002: Edit should provide a usable entity-level toolbar for saving fields. We don't want to reroll that issue for minor things like this.

I split off "Make sure Edit works at all when a same entity exists multiple times on the same page (possibly in a different view mode). Also: all instances of the same entity on the same page should be updated when one of them is modified." to another issue: #2075185: When an entity is in-place edited (i.e. saved), other instances of that entity on the same page are not updated (no propagation).

Updated issue summary.

We're not fixing this in the current sprint.

Split off an important part to https://drupal.org/node/2075185.

Created child issues to handle each individual part of this task, it also makes each change much easier to review.

1. #2133869: Clean up Edit's data- attributes
2. #2133871: Remove dead code from Edit: Drupal.edit.AppView.enableEditor
3. #2133877: Clean up Edit's AppView variable names
4. #2133889: Clean up Edit: rename EditorDecorationView to FieldDecorationView
5. #2133897: Clean up Edit: don't pass AJAX URLs from the server to the client through drupalSettings, use Drupal.url() instead
6. #2133907: Clean up Edit's in-place editors: consistent naming, library naming and file naming

Added two more child issues:

1. #2134929: Clean up Edit: rename EntityView to EntityDecorationView
2. #2135689: Clean up edit.module to match coding standards

The remaining 3 issues would ideally be committed in this order:

1. #2134929: Clean up Edit: rename EntityView to EntityDecorationView
2. #2135689: Clean up edit.module to match coding standards
3. #2133889: Clean up Edit: rename EditorDecorationView to FieldDecorationView

(To avoid patch rerolls.)

All done now! Closing :)