Introduce string based validators with wildcards

[Piotrek Koszuliński]

Extracted from #10191. That patch removes support for function and regexp based validators, so we can introduce wildcards support for string based ones.

E.g.: attributes: 'data-*'

[Piotrek Koszuliński]

Required by #9764.

[Olek Nowodziński]

Created branch ​t/10202 + tests.

Introduced:

• Wildcards in string format:

  span[data-*](class*)
  

• Regex in object format:

  'h*': true,
  a: {
  	attributes: [ 'href(lang)?$', 'rel' ],
  	classes: [ 'class[^\\d]?(?!.*moo$)' ]
  },
  '$1': {
  	elements: 's(ub|up)'
  }
  

[Wim Leers]

Needed in Drupal: ​http://drupal.org/node/1936392#comment-7233668.

[Piotrek Koszuliński]

I pushed both branches. Dev is rebased on major, tests rebased and one commit is added.

As failing tests prove:

• Required attributes do not work when used with wildcard. It may be unclear how span[!data-*] should work, but I think that the rule is simple - at least one data-* attribute is required. Making this work will require changes to the hasAllRequired funtion.
• The * character in object format should not be replaced with .* as it is done for string format. Thus, that replacement has to be done earlier - when we still know that string format was an input - perhaps during rule normalization. This implies that only the regexp format will land in filter.allowedContent. So more tests for rules normalization have to be added.

Note: I reviewed only filter/filter tests - the rest may require update too.

[Piotrek Koszuliński]

Workaround for this missing feature was described here: ​http://dev.ckeditor.com/ticket/10471#comment:1

[Frederico Caldeira Knabben]

We need feedback on this to understand if this is still critical and therefore eventually target it to the 4.3.

[Piotrek Koszuliński]

Pushed ​branch:t/10202b on dev and tests.

[Piotrek Koszuliński]

Fixed on major with ​git:6563276 on dev and 74d2a6b on tests.