channel: Fix +m (moderated) and +R (registeredonly) channel modes, add note about opers overriding +m/+R

irc/channel.go

 	channel.membersMutex.RLock()
 	defer channel.membersMutex.RUnlock()
 
+	// server operators override nooutside, reggedonly, moderated etc.
+	// TODO(dan): there should probably instead be a SAPRIVMSG instead that forces this instead of doing it this way...
 	if client.flags[Operator] {
 		return true
 	}

irc/modes.go

 
 	// SupportedChannelModes are the channel modes that we support.
 	SupportedChannelModes = Modes{
-		BanMask, ExceptMask, InviteMask, InviteOnly, Key, NoOutside,
-		OpOnlyTopic, Secret, UserLimit, ChanRoleplaying,
+		BanMask, ChanRoleplaying, ExceptMask, InviteMask, InviteOnly, Key,
+		Moderated, NoOutside, OpOnlyTopic, RegisteredOnly, Secret, UserLimit,
 	}
 	// supportedChannelModesString acts as a cache for when we introduce users
 	supportedChannelModesString = SupportedChannelModes.String()