Improve logging of texture loading errors.
Fix crash with missing light states.
Add profiling, logging and F5 DEBUG info for SoundProcess.
Tidy up processes, so that UpdaterProcess is always used (even in single-proc mode) but not always on its own thread.
Set thread names for debugging.
git-svn-id: http://svn.uktrainsim.com/svn/openrails/trunk@393 a9f3cfff-6c41-7446-b0ca-052bd761e6eb