Allow BEM style CSS-classes

I just realized that 7.x-1.0-rc2 utilizes the core drupal_clean_css_identifier() function to sanitize CSS-classes. There are lots of reasons why using the same sanitizer as core would be a good idea, but the result here is that BEM style CSS-classes are not possible to enter as list- and row class attributes (just to name two places). card__list-item becomes card--list-item, which means something entirely different in BEM lingo. There are a bunch of issues for both Views (https://www.drupal.org/node/1371118) and core (https://www.drupal.org/node/2009584 and https://www.drupal.org/node/1109854) where users are experiencing this issue.

drupal_clean_css_identifier() in its current form prohibits modern, sane CSS-architectures, and since even the comments inside the function states that underscore is a valid character I'd label that as a serious bug (for front-end'ers at least). And since a fix for core won't happen until D8 at the earliest, my request is that semanticviews ”solve” this bug with it's own semanticviews_clean_css_identifier() sanitation-function until a fix is committed to core.

My ”fix” for the time being is to use 7.x-1.0-alpha1 where from what I can tell there's no CSS class-sanitation in the same way as in 7.x-1.0-rc2. But of course I'd prefer to use the latest and greatest version.

I'm sure I can supply a patch for this if this is something that the maintainers would consider.