Fixing an issue with static Wedges

Changed something stupid before committing at the last second before bed, and clearly didn't test it enough. Working again now. I also improved the logic that dictates which faces to actually bother drawing.

I also made a slight cosmetic change to Stratocaster, completely unrelated to Wedges.
Streamlined Wedges a li'l, made new Ramps

Old style Avara ramps are still available, using `<blockramp>` -- syntax otherwise unchanged.
Merge https://github.com/rherriman/pavara