grextras: save scrambler headers
grextras: work on scrambler blocks and unit test
grextras: logic for sync word support
grextras: some work on sync work test
grextras: fixes and test for sync word
grextras: length tag increase logic for sync word
grextras: grc xml files for scramblers
Merge branch 'scramble'
grextras: make serializer have similar structure to scrambler