edje: Edje_Edit - add functions that allows user to set and get frequency value of...

edje: Edje_Edit - add functions that allows user to set and get frequency value of tones in collection

Summary:
This commit contains two new functions for tones editing:
edje_edit_sound_tone_frequency_set() and edje_edit_sound_tone_frequency_det()
To avoid code duplication the macross GET_TONE_BY_NAME is added and the
lines that performed the search of tone by name are replaced with this macro.

@feature

Reviewers: cedric, Hermet, seoz, raster

CC: reutskiy.v.v, cedric
Differential Revision: https://phab.enlightenment.org/D1030

Signed-off-by: Cedric BAIL <c.bail@partner.samsung.com>