The edc debugging is difficult because users can not check
whether or not any program is executed or the state of part.
If users can print that property, they can do debugging more easily.
This "printf" feature is for debugging edc.
add printf("test : %s %d %f", "text", 1, 0.5); in the script in the edc
build it by edje_cc
excute it and see the log
Reviewers: cedric, raster, jpeg
Reviewed By: jpeg
Differential Revision: https://phab.enlightenment.org/D3499