Temporarily restrict /ctstats to admins

Pretty much copied over Rourke's version for /ctgs. 

Needs testing and review

Edit: There seems to be an issue with the pom regarding namelayer. I'm not quite sure, because I pulled from this exact repo and only changed the version number. >_>

[ERROR] Failed to execute goal on project Citadel: Could not resolve dependencies for project com.untamedears:Citadel:jar:2.6.14-SNAPSHOT: Failed to collect dependencies at com.valadian:NameLayer:jar:[1.0,): No versions available for com.valadian:NameLayer:jar:[1.0,) within specified range