Standardize actors colors

[Clarkszw]

I have added a new function check_color_range() `normalize_color()' in utils.py for #458
It does two things:

1. check if the color array is in range [0, 1]
2. if not, it will change it to red color [1, 0, 0] and print the out of bounds information normalize the color array.

I have written an unit test for this function and added in test_utils.py

All tests in test_actors.py and test_utils.py are passed :)

[skoudoro]

Hi @Clarkszw,

Thank you for starting this.

See below for some comments:

1. Concerning docstring, I recommend you looking at the numpy style guide. Many python projects follow those rule which you are not following right now on this PR. here the link:
   https://numpydoc.readthedocs.io/en/latest/format.html

2. Why red? I recommend you to normalize your color values to go from [0-255] to [0-1]

[skoudoro]

Hi @Clarkszw,

it looks much better. I need to play a bit more with this PR to make sure we do not fall in weird cases.

Thank you for this and I will give you an update next week.

[skoudoro]

also, can you solve the conflict in this PR ? thank you

[Clarkszw]

I have no idea why it will happen..But the conflict has been fixed now:)