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

VersionGuiEntry is now a proper class.

Fix filter text when choosing Zandronum binaries

Improved wording on the unknown version prompt, replaced the command link buttons with a more regular button box

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mercurial