Dan Poltawski 0e34e46fd0 MDL-56488 boost: validate scss settings for parsable scss
* Parses the scss and fails validation if a parse error is found

* Does not detect the situation when variables are not present - this
  would involve us parsing the entire tree and would be slow. It could
  also change over time, depending on whats defined in the scss
  from themes.

* Introduces a new admin_setting_scsscode to do this
2016-12-23 09:51:29 +00:00
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