[Bleeding] Cleaned up unsafe casts. Addresses BUKKIT-844

Removed internal collection leaks from PluginDescriptionFile
BREAKING: PluginDescriptionFile.getAuthors() now returns List instead of
ArrayList

Various places with unsafe generics, notably List<Object> getList() in
Configurations are now referenced as <?>. This is nonbreaking, but
sourcecode will need to be revised when compiled.

By: Wesley Wolfe <weswolf@aol.com>

paper-api/src/main/java/org/bukkit/event/HandlerList.java

@@ -9,7 +9,6 @@ import java.util.Map.Entry;
 /**
  * A list of event handlers, stored per-event. Based on lahwran's fevents.
  */
-@SuppressWarnings("unchecked")
 public class HandlerList {
     /**
      * Handler array. This field being an array is the key to this system's speed.
@@ -203,6 +202,7 @@ public class HandlerList {
      *
      * @return the list of all handler lists
      */
+    @SuppressWarnings("unchecked")
     public static ArrayList<HandlerList> getHandlerLists() {
         return (ArrayList<HandlerList>) allLists.clone();
     }