[lazarus] New gtkglarea demo

[Mattias Gaertner]

Hi all,

Thx to satan, there is a new gtkglarea demo which demonstrates lighting, blending and animation. Simply compile and start it:

cd <lazarusdir>/components/gtk/gtkglarea
make
./gtkglarea_demo

It's amazing!

There is also an improved opengl unit with a lot of nvidia extensions (nvgl.pp).


Normal bugfixes:
  - Buttons now react to Return key. 
  - MessageDialogs have now a default Button.
  - Splashform is more visible.
  - reduced lcl output

Mattias