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/Spacegaga_out0.js

@@ -2,7 +2,7 @@
 
 function enter(pi) {  
 	if (pi.getPlayer().getEvents().getGagaRescue().fallAndGet() > 3) {
-	    pi.warp(922240200, 0);
+	    pi.playPortalSound(); pi.warp(922240200, 0);
 	    pi.getPlayer().cancelEffect(2360002);
 	} else
 	    pi.playPortalSound(); pi.warp(pi.getPlayer().getMapId(), 0);