strip html tags from inclusion syntax

Ticket

+commit
 

sometimes a user will accidentally add html tags to an inclusion.  For example, when editing in tinyMCE, if you make something bold and then unbold it, you may be left with empty span tags, and your inclusion may look like this:

{{my image| <span>size:icon</span>}}

those spans can currently break things.

 

 

{{bruce logo| <span>size:</span>}}: