font bitmap generator prototype v2

[eddy]

Updated
- added : new fields "min width" and "min height"
- added : fixup about the GetGadgetAttribute problem.
- added : drawing management by threads

[eddy]

Updated
- added : a window to test your bitmap font
- added : rendering progressbar
- added : popup for settings

Now you can test your bitmap font right after the rendering.
I improved the rendering (more smooth)

I tried to implement the parallel code for the rendering but perhaps it's too MUCH!