new release version,

Features:
- screenshot function,
- transparency support,
- wireframe paint option,
- support phong model (ambient, diffuse, specular),
- 2 different kinds of light (directional and point),
- different background colors for light on/off,
- zoom speed now adjustable via +/- keys,
- new file info window,
- more information displayed at the info window,
- settings window,
- new GUI,
- now openGl 2.0 is minimum (before 4.5)
- some more code changes, bug fixes, performance improvements,
Bugs:
- nothing known