add better rich control pointers.
this patch totally re-implemenet live edit function
since the draggable part has a lots of limitation to control it by user.
Summary: Created new groups to setup as bg for dragable area in Drag-n-Drop mode.
Reviewers: Hermet
Projects: #enventor
Differential Revision: https://phab.enlightenment.org/D1323
Conflicts:
src/bin/live_edit.c
ChunEon Park
Kateryna Fesyna