- make e_thumb fork internally

- make e_thumb fork internally
- add queue / dequeue calls to e_thumb
- change e_icon_layout to e_icon_grid
- add e_icon_canvas which will eventually allow for free icon placement and optimized scrolling using a tiles principle
- add new calls to e_widget_image
- add new bg selector (broken because of a segv on cancel press, needs fixing)

NOTES:
- bg selector needs fixing.
- efm still needs work, will segv if you scroll while files are generated
- other efm bugs exist so I would advise that you dont use it atm
- if we dont need e_icon_grid (strict grid layout) we should remove it.

SVN revision: 18593