This enables us to use more efficient calling conventions and
also helps us keep the on-disk structure of a msg object more
consistent in future releases.

This enhances performance and, as some have pointed out, is
probably also more consistent with what users expect how
the various output-timestamp related function should work. This
commit needs some more testing.

...which enables to work with
less acurate timestamps in favor of performance. This enables querying
of the time only every n-th time if imudp is running in the tight
receive loop (aka receiving messsages at a high rate)

- added message property "inputname", which contains the name of the
  input (module) that generated it. Presence is depending on suport in
  each input module (else it is blank).
- added system property "$myhostname", which contains the name of the
  local host as it knows itself.

Signed-off-by: Rainer Gerhards <rgerhards@adiscon.com>

- bugfix: TCP input modules did incorrectly set fromhost property
  (always blank)
- bugfix: imklog did not set fromhost property
- added "fromhost-ip" property
- added "RSYSLOG_DebugFormat" canned template
- bugfix: hostname and fromhost were swapped when a persisted message
  (in queued mode) was read in

reduced dependencies, moved non-runtime files to its own directory except
for some whom's status is unclear