The config forms CSS styles were hobbled together from a bunch of styles found in Review Board, RBCommons, and Splat, and in the process of moving these into Djblets, we ended up with some unwanted rules and some very specific styling and naming that didn't make sense to keep in Djblets. We also have some new styles coming for config forms that was hard to put in without a bit of a cleanup. This change moves the styles to our new CSS naming standards, helping create a more logical, organized, documented set of components we can build upon, and in the process helps us move away from a bunch of unwanted styles. We still have those styles, and the old names, for backwards-compatibility purposes, but going forward we have a stronger foundation to build upon, and a clear path to deprecation. Some of these styles might come back in some other form later, but the intent is to go back to something closer to a bare minimum. That said, none of this is set in stone yet, and there are many form-related styles that deserve its own cleanup (and are not considered "stable" at this point). To help with review, this change does not reorder the styles into logical sections, instead retaining the rough order of the original styles. The next change in the series builds upon this to group related styles into logical sections in the stylesheet.

This wraps up the new config form organization change by moving the styles into a logical order, grouping component-related styles together and ensuring alphabetical order. It doesn't make any changes to the styles themselves.