Portal sound effects + Improved skillbook drops

Added portal crossing sound effect on several scripted portals which were missing it.
Added a few more scrolls on Spindle.
Added several skill/mastery book drops, making "4th job skill questing" somewhat more viable.

scripts/portal/magatia_alc0.js

@@ -20,7 +20,7 @@
 
 function enter(pi) {
         if(!pi.isQuestStarted(3309) || pi.haveItem(4031708, 1)) {
-            pi.warp(261020700, "down00");
+            pi.playPortalSound(); pi.warp(261020700, "down00");
         } else {
             pi.playPortalSound(); pi.warp(926120000, "out00");
         }