Prevote skip

[BFlorry]

Prevote skip for videos, the further it is from the current video, the more skip votes it needs.
Current video needs the regular 5,
2nd needs 7
3rd needs 10
4rd needs 15
5th needs 20

The skips are stored as percentages (5th place gets 15/20, which is 75% and on 4th it has 11,25 -> 11/15, always round downwards (1,9 -> 1))