Only include date in full version signature if not in a release

Added the ability to automatically look up wad paths from other sources (for now just Doomseeker's configuration). By default, ZCinema will automatically do such a lookup if it fails to find a WAD needed for demo playback. This can also be invoked manually in the config prompt.

A few minor touchups

(0) -30 -10 -3 +3 +10 tip

mercurial