Python improvements

[guneysus]

• Functions definitions default *args, **kwargs
• Prop now shorthand of property
• . snippet disabled, because overlaps autocomplete plugins.

[lpil]

Could you remove or rename the self snippet, rather than commenting it out please?

I'll leave someone else to too over the rest- I'm not a Python user, and I'm sure others have strong opinions on these snippets. :)

[guneysus]

Now can be merged. Only *args, **kwargs improvements.

[SirVer]

_args, *_kwargs seems like an addition that people will basically always delete. I checked UltiSnips and we have ~3% of functions using one of them and none using both. Remove again?

[guneysus]

Nothing changed in this commit except *args, **kwargs. The prop shorthand can be ignored.
I find difficult that typing *args, **kwargs. Now can be closed 👍

[lpil]

Why not add a snippet for *args, **kwargs? :)

[guneysus]

Make sense. Ok. 👍