[Feature Request] Map Weight For Random

[RitzDaCat]

This is a feature request to allow map weights to help modify the random formula for map selection. The goal is that some maps are more favorable for a competitive environment but we do not want to fully eliminate lesser played maps. An example for weight would be default behavior is 1 but if a map is set to .5 then its 50% less likely to be included in the random or if the weight is 2 for example it would be twice as likely.