Added in 2.9
Returns the Nth server variable discovered during raw 004 and 005 events.
Raw 004 tokens are added as _usermodes, _channelmodes, _channelmodesargs.
Raw 002 tokens are added as _ircdversion.
N - If N = 0. number of variables, otherwise the Nth variable.
key - Returns the value from a key=value variable.
.value - Returns the value for the variable if it was discovered as key=value.
.key - Returns the key/name of the variable.
; Check for channel types //echo -ag $iif($servervars(CHANTYPES),channel types for this server is $servervars(CHANTYPES),channel types was not found)