More Masteria quests + several minor fixes

Added more quests on Masteria and updated drop data in the region. Fixed
mystic door on slopes deploying players unproperly. Fixed mounts
equipped by low level players crashing the client.

scripts/portal/glpqEnter.js

@@ -0,0 +1,9 @@
+function enter(pi) {
+    if (pi.haveItem(3992041, 1)) {
+	pi.warp(610030020, "out00");
+        return true;
+    } else {
+	pi.playerMessage(5, "The giant gate of iron will not budge no matter what, however there is a visible key-shaped socket.");
+        return false;
+    }
+}