Added NC Error codes

[dewabe]

Just a small thing, but enhancement anyway

Based on #457

[chrisbeardy]

this is great! Please tell me you didn't do this manually, must have taken ages! thanks! To maintain compatibility with python 3.8 which we currently still support, can you remove the typing please. Given they are constants I see no harm at the moment, or use 3.8 compatible typing. Thanks.

[coveralls]

Pull Request Test Coverage Report for Build 20347441845

Details

• 16 of 16 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 93.887%

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Totals
Change from base Build 20267830446:	0.05%
Covered Lines:	1797
Relevant Lines:	1914

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💛 - Coveralls

[dewabe]

To be honest, no. I did not do this manually. I started it manually, but no.. In my opinion, such a task is good to give to AI to pre-progress, and the validity can be checked afterwards. Obviously, not all the lines are double checked by me but many are.

Anyway:
Typing is removed now!

[chrisbeardy]

I completetly agree