Keyhunt: fix #2344 "KeyHunt: Unfair scoring when key is destroyed when playing with...

Keyhunt: fix #2344 "KeyHunt: Unfair scoring when key is destroyed when playing with 4 teams"

Fixed by saving total player score internally as a float, distributing the score to players truly evenly,
by using the new version of DistributeEvenly_Get that doesn't round the score
and updating the actual score to the rounded value of the exact score.

The version of DistributeEvenly_Get that rounds is now called DistributeEvenly_GetRounded (currently unused)

Also clean up DistributeEvenly_Init and DistributeEvenly_GetRandomized code (no logic changes)