Rotation server drops significantly when new round starts

[cetteup]

Despite the weighted average changes implemented to address #115, the changes fixing #116 cause significant rotation server score drops at the start of a new round.

On vehicle servers, it is not uncommon for players to have 0 score/kills/deaths for several minutes as the round starts - especially after a map change. Consider the following scenario (server weight is 1.0):

Time	Active Players	Scores	Rolling avg
t	60	60 60 60	60
t+5	0	60 60 0	40
t+10	30	60 0 30	30
t+15	55	0 30 55	28.3
t+20	60	30 55 60	48.3

Not only does the server score drop by half because many players are considered "inactive" at the start of the new round at t+5. The score also takes a while to recover. It may make more sense to only factor in active players to some degree, e.g. make them account for 10% of the score. The scenario looks much less drastic which such an approach:

Time	Human Players	Active Players	Scores	Rolling avg
t	60	60	60 60 60	60
t+5	50	0	60 60 45	55
t+10	55	30	60 45 52.5	52.5
t+15	60	55	45 52.5 59.5	52.3
t+20	60	60	52.5 59.5 60	57.3

The score drop is much less significant and recovers faster.