SCSS: Use custom functions

[ma-jahn]

Hi @Sqrrl ,

we really like your addon and it's working great out of the box with a basic setup.
But as soon as we are using custom functions the presenter is no longer working.

Example:

$font-size: rem-calc(16px)

The presenter is not aware of our function rem-calc and therefore interpreting rem-calc(16px) as value wich results in an empty / broken preview.

Is there a way to load custom functions / mixins so the presenter would no longer show rem-calc(16px) but 1rem?

Thank you!