evas filter: Implement inverse color filter
Summary: This is the first version of inverse color filter both GL and SW.
- Create filter_example with following .
efl_gfx_filter_program_set(image, "inverse_color ()", "inverse color");
./filter_example (Use ELM_ACCEL=gl for GL engine)
Reviewers: Hermet, jsuya
Reviewed By: Hermet
Differential Revision: https://phab.enlightenment.org/D10335