Summary:
Add function, which provide fast save group(s) back into edj file,
bypassing the source code generation.
Reviewers: raster, seoz, cedric, Hermet, reutskiy.v.v
CC: cedric, reutskiy.v.v
Differential Revision: https://phab.enlightenment.org/D1053
Signed-off-by: Cedric BAIL <c.bail@partner.samsung.com>