Mark which allowed content rules were added by which features

[Reinmar]

This isssue is extraced from #9829.

Make it possible to create feature => allowed content object.

Since Drupal will have something like drag&drop toolbar builder it will need to know which button adds which "allowed content"

[Reinmar]

I pushed quick preview of how this issue should be solved to ​t/9994.

With this code it is possible to create a feature => contentn map.

var rules = CKEDITOR.instances.editor1.filter.allowedContent,
	rule, name
	obj = {};

for ( var i = rules.length; i > 0; ) {
	rule = rules[ --i ];
	name = rule.featureName || ':(';
	if ( !obj[ name ] )
		obj[ name ] = [];
	obj[ name ].push( rule );
}

// obj contains feature => content map

This is not complete yet, so you'll see few rules without names (in ':(' property).

[Reinmar]

Pushed t/9994 to ​dev and tests (both based on ​t/9829).

[Reinmar]

Rebased branched on major.

[Reinmar]

Merged to major on ​git:85dfc91 on dev and 5263b41 on tests.

[Wim Leers]

Quite elegant patch :)

Referenced at ​http://drupal.org/node/1894644#comment-7115604, where this feature will be put to use.