New PQ: Boss Rush PQ + Ellin/PiratePQ bug fixes

Introducing Boss Rush PQ. Corrected a few issues regarding rewardings in
PiratePQ and EllinPQ and implemented a standardized way to script PQs.

wz/Item.wz/Etc/0403.img.xml

@@ -14516,8 +14516,7 @@
       <canvas name="iconRaw" width="31" height="28">
         <vector name="origin" x="-1" y="30"/>
       </canvas>
-      <int name="price" value="1"/>
-      <int name="quest" value="1"/>
+      <int name="price" value="1500"/>
     </imgdir>
   </imgdir>
   <imgdir name="04032475">