Create the compress module for compression functions.

For the moment there is only the lzxpress compression used by DRS

Bug: 10546
Change-Id: Ifc7e1767934224c0198f0b09caa3efbad979ca1f
Reviewed-on: https://code.wireshark.org/review/4600
Petri-Dish: Anders Broman <a.broman58@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Michael Mann <mmann78@netscape.net>