Issue #3253779 by mxh: Views integration

Optional sub-modules included:

* "Mustache Logic-less Tokens" (`mustache_token`): Automatically enhances the

  Token system everywhere token replacement is possible (see section 3.2).

* "Mustache Logic-less Views" (`mustache_views`): Use Mustache variables

  including Tokens within Views configurations. For example, you can use a

  variable in the input for a fixed default argument within contextual filters.

* "Mustache Logic-less Templates: Even more magic" (`mustache_magic`):

  Adds more magic variable plugins to Mustache Templates, for example {{#sync}}.

  More about this module see section 3.6.