Contiguous selection and keyboard input for mod lists.

Tweak console to take up the sides.
You can reorder mods from the keyboard.

gui/ModListView.h

@@ -1,6 +1,8 @@
 #pragma once
 #include <QTreeView>
 
+class Mod;
+
 class ModListView: public QTreeView
 {
 	Q_OBJECT