More HUD GUI improvements.
Signed-off-by:Craig Russell <tenowg@thedemgel.com>

More HUD GUI improvements.
Signed-off-by:Craig Russell <tenowg@thedemgel.com>

More HUD GUI improvements: Fixed NPE with adding custom Widget
Signed-off-by:Craig Russell <tenowg@thedemgel.com>

Chenge to QuickbarInventory
Merge pull request #525 from tenowg/master

Breakdown of Vanilla gui: Improvements, added hunger widget