Added play-rfx command line option.

PCAP dumps can now be played with /play-rfx:path_to_file again.
Added auth-only parameter to new command line syntax

auth-only only authenticates. This can be used for credential testing.
Username and password are required for auth-only
server/sample: fix build

Needs now also to be linked against winpr-error
server/x11: build fix when xfixes is disabled
core: update play-rfx to work with async-updates
Merge pull request #1291 from bmiklautz/misc-fixes

Misc fixes