Add SkyBlock guild statistics

[MaxKorlaar]

This would be a page like the other game statistics for guilds, but it would display some general SkyBlock statistics, and would calculate a total and average of those stats so that people can easily compare guilds against each other.

A problem would be that players have multiple SkyBlock profiles. A way to solve this is to use the currently active profile/last played profile – allowing people to select the profile per guild member would not be doable.