Made XML Sandbox non-modal, using a glass pane

src/main/java/net/vhati/modmanager/ui/Nerfable.java

@@ -0,0 +1,16 @@
+package net.vhati.modmanager.ui;
+
+
+/*
+ * An interface to en/disable user interaction.
+ * It was written with JFrames and glass panes in mind.
+ */
+public interface Nerfable {
+
+	/*
+	 * Either nerf or restore user interaction.
+	 *
+	 * @param b the nerfed state
+	 */
+	public void setNerfed( boolean b );
+}