advanced split widget

[vitaly]

I implemented the first version of grid split widget. This widget I implemented at home at free time. I haven't lots of time to fully done this work. So this version has many additional features whose I'll implement later. The current version supports closing and maximizing of widgets.

If you desire to help develop this widget, please, contact with me or upload your patches or versions into this site. I will upload newest versions as soon as I find free time for improvement.

TODO (I plan to do this later):

1. Make setting of margins of widgets in the splitters.
2. Fix initial size of child widgets.
3. Make icons.
4. Improve restore of widgets.
5. Optimize it.

I will appreciate any bugreport or feedback about this widget.

Vitaly