Colons in Snapshot Filename

On OS X and Linux, we use colons to format the time code in the snapshot's names. That's not exactly a great idea, especially on Mac OS X with it's Carbon heritage. Better use underscores instead.

Credit to Jeremy (jbutler) on the forum for reporting.

http://forum.videolan.org/viewtopic.php?f=12&t=42048&p=131370#p131370

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