Changeset 1601 for code/branches/hud/bin

• new folder structure for overlays:

orxonox/

…
overlays/

console/
hud/

• Navigation —> HUDNavigation
• HUD —> OverlayGroup (not yet begun with that except renaming and getHUD() instead of getSingleton())
• moved HUD.oxo (file ending should stand for orxonox overlay) to media repository in overlay folder
• fixed a bug with console noiseSize_ config value (was inverted..)