Refactor: Change from BUInt8 to UBInt8 form
Refactor: Change from BUInt8 to UBInt8 form

This matches the convention in the construct library and seems to be a bit
nicer to look at in general.  Much easier to make the change now then later.

digidotcom/python-suitcase,digidotcom/python-suitcase,nateglims/python-suitcase,rtzoeller/python-suitcase,nateglims/python-suitcase,rtzoeller/python-suitcase