gpick added infra for Font-Preview
Need to impl font preview, take font from EDJ file.

Signed-off-by: Aharon Hillel <a.hillel@samsung.com>
Added infra to show group preview
Also added infra to track gl-item selection,unselection

Signed-off-by: Aharon Hillel <a.hillel@samsung.com>
Added image,sample,font overwriting
TODO: Need to enanle this in edje_pick_core.c
TODO: Also the enable, disable of buttons is still buggy.

Signed-off-by: Aharon Hillel <a.hillel@samsung.com>
Not checked push