[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/command/defaults/VersionCommand.java

@@ -1,7 +1,8 @@
 package org.bukkit.command.defaults;
 
-import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.List;
+
 import org.bukkit.ChatColor;
 import org.bukkit.Bukkit;
 import org.bukkit.command.Command;
@@ -67,7 +68,7 @@ public class VersionCommand extends Command {
 
     private String getAuthors(final PluginDescriptionFile desc) {
         StringBuilder result = new StringBuilder();
-        ArrayList<String> authors = desc.getAuthors();
+        List<String> authors = desc.getAuthors();
 
         for (int i = 0; i < authors.size(); i++) {
             if (result.length() > 0) {