Mute the linking sound on client kicks

This commit is really quite awesome in that you can now propagate any
plLinkToAgeMsg that will mute the link out, link in sounds, or both. Some
garbage fields were repurposed for this functionality. The messages were
passed correctly on Cyan's MOULa server.

Conflicts:

	Sources/Plasma/PubUtilLib/plMessage/plLinkToAgeMsg.h
	Sources/Plasma/PubUtilLib/plNetClient/plLinkEffectsMgr.cpp
	Sources/Plasma/PubUtilLib/plNetClient/plNetClientMgr.h
	Sources/Plasma/PubUtilLib/plNetClient/plNetLinkingMgr.cpp

Sources/Plasma/PubUtilLib/plNetClient/plNetCliAgeJoiner.h

@@ -85,6 +85,7 @@ typedef void (* FNCAgeJoinerCallback)(
 void NCAgeJoinerCreate (
     plNCAgeJoiner **        joiner,
     const NetCommAge &      age,
+    bool                    muteSfx,
     FNCAgeJoinerCallback    callback,
     void *                  userState
 );