Changed PluginDisableEvent to fire before the disabling of a plugin, instead of after (where it's then invalid). Thanks to holic for the PR.

By: Nathan Adams <dinnerbone@dinnerbone.com>

paper-api/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java

@@ -991,6 +991,8 @@ public class JavaPluginLoader implements PluginLoader {
         }
 
         if (plugin.isEnabled()) {
+            server.getPluginManager().callEvent(new PluginDisableEvent(plugin));
+            
             JavaPlugin jPlugin = (JavaPlugin) plugin;
             ClassLoader cloader = jPlugin.getClassLoader();
 
@@ -1000,8 +1002,6 @@ public class JavaPluginLoader implements PluginLoader {
                 server.getLogger().log(Level.SEVERE, "Error occurred while disabling " + plugin.getDescription().getFullName() + " (Is it up to date?): " + ex.getMessage(), ex);
             }
 
-            server.getPluginManager().callEvent(new PluginDisableEvent(plugin));
-
             loaders.remove(jPlugin.getDescription().getName());
 
             if (cloader instanceof PluginClassLoader) {