Added NWN Dark Sun module contents

Added NWN Dark Sun module contents.

nwnds_module/x_ch_main_used.nss

@@ -0,0 +1,20 @@
+// the use script for the game control system.
+
+void main()
+{
+    string sTag = GetTag(OBJECT_SELF);
+    int iSeperator = FindSubString(sTag, "_");
+    string sWhite = GetSubString(sTag,0, iSeperator);
+    string sBlack = GetSubString(sTag,iSeperator+1, 10);
+
+    SetCustomToken(300, sWhite);
+    SetCustomToken(301, sBlack);
+
+    object oPC = GetLastUsedBy();
+    if (GetIsObjectValid(oPC) == FALSE)
+    {
+        SpeakString("Used by invalid object.");
+        return;
+    }
+    BeginConversation("chess_main", oPC);
+}