Re-unified source, HDK2 support, side-by-side fixes, etc.

This release contains a refactoring of the firmware and the re-unification of the HDK2 firmware with the main firmware source base.

User-facing fixes included in this release over 1.94 include:

• More consistent handling of side-by-side mode on the HDK 1.x.
• Improved USB product name and serial number reporting.
• Fixes imported from upstream (ASF) related to USB enumeration.