Make cvar_cl_allow_uidtracking an int thanks to a patch to ReplicateVars: replicated...

Make cvar_cl_allow_uidtracking an int thanks to a patch to ReplicateVars: replicated cvars are now sent to the server on connection even if not changed so that server can process them properly

cvar_cl_allow_uidtracking as string was networked on connection because code immediately detects a change (null value "" != default value "0"), not possible as int (null value 0 == default value 0)