Support extended white space control operators in Twig templates

[Chi-teck]

Those have been added recently.
twigphp/Twig#2925

Example:

  {%~ if foo ~%}
Test
  {%~ endif ~%}

The above code produces the following Twigcs violations.

• ERROR There should be 1 space(s) after opening a block.
• ERROR There should be 1 space(s) before closing a block.
• ERROR There should be 1 space(s) before "~".
• ERROR There should be 1 space(s) after "~".
• ERROR There should be 1 space(s) after opening a block.
• ERROR There should be 1 space(s) before closing a block.
• ERROR There should be 1 space(s) before "~".
• ERROR There should be 1 space(s) after "~".

[OwlyCode]

This is on master, and scheduled for next beta version.