For the vendor code to make it through string conversions unharmed, we should make it part of the printable ASCII subset. Fixes compatibility with xusb when reading WCID descriptor.

This is some Microsoft-specific gunk which allows us to work with usermode apps without any onerous driver installation. Much better user experience!

Thanks, OpenMoko!

Originally I wasn't planning on doing this, but since I need to reclaim some RAM anyway, might as well just start hacking out everything we don't need...