A night to remember - main menu video replacement

Replaces main menu video with the iconic Witcher 3 "A night to remember" launch cinematic

I edited the video so it didn't have the unnecessary marketing bits at the beginning and end.

As of now it's not possible to add custom audio tracks due to the way the audio is implemented, but I might be able to change the menu music track to another one from the game, if i succeed i'll add an optional download for it.