Suggestion: Load differently named "HD" opening video when present.

[thegreatprophetzarquon]

As Tweaks supports HD videos, it would be nice if it could check for a separate file in the "mv" folder (say "HDTitleScreen.bik") or use a separate "HD MV" folder and load that if present rather than having to replace the existing TitleScreen.bik file. This would make it easier to distribute any replacement videos and would make it easier to swap back to a vanilla install. This would be in keeping with how .flac and texture files are used.