move header table to tmp
fix HeaderField, HeaderSet
add HeaderSet.ToHeader()
readd header_table
add test HeaderField.Size()
fix header_table.Size()
refuctoring
readd context
tmp commit
readd reference set
update reference set
readd emmited set
readd util.go
tmp commit
fix NewHeaderField supports must header prefix
update RemovePrefix test
move HeaderToHeaderSet test to util_test.go
up
up
add ReferenceSet Add(), Len(), Empty()