Trigger: Remove usage of "extern" ByteStream_StorageType
This is a follow-up MR to !21339 (merged) in order to remove the usage of the extern
symbol ByteStream_StorageType
from all Trigger bytestream converters.
Also delete the orphaned HLTResultByteStreamCnv.icc
file, which was not included anywhere and probably a left-over from a very early implementation.
Edited by Frank Winklmeier