Key mapping and HUD

[gweltou]

Hi,

Would you consider accepting my pull request ?

It fixes the HUD : beginHUD was referencing the nonexistent 'originalMatrix' variable. It adds the possibility to modify the key mapping through member variables ('key_up', 'key_down', 'key_forward' and so on...). One sketch was added to the 'examples' dir to illustrate this option. The package path was renamed from 'src/template/library/QueasyCam.java' to 'src/queasycam/QueasyCam.java'.

Thanks !