Implements mouse_pos function
Implements corresponding tests
Two modes included, single and multiple.
TODO:
How to tests functions needing user inputs?
Signed-off-by: Julien Lengrand-Lambert <julien@lengrandlambert.fr>
Some errors corrected in function code.
Adds "real life" tests with an image an non zero pixels count.
Examples to be added soon, with mouse value operations.
Signed-off-by: Julien Lengrand-Lambert <julien@lengrandlambert.fr>