PEP8 compliance

[YgorSouza]

According to the Blender addon guidelines, addons must comply with PEP8 in order to be approved for distribution with Blender. Since this addon could potentially be useful for a lot of people, I think it would be good to comply with the standards, in case it reaches a level of maturity at which it could be submitted for approval.

I ran the flake8 analysis on the code, and it found many issues, mostly related to whitespace. Fixing these issues would require changes to the entire code base.

flake8_results.txt

I would like to know if such changes are acceptable or if there is a particular reason why the code was formatted this way. If there is no problem, I could make the necessary changes and submit a pull request.