Add array slice method

[creikey]

Closes #4715 if pythonic syntactic sugar is decided to be not needed.

[karroffel]

This needs to be part of the Core 1.2 extension and not placed in here, as this will cause binary compatibility issues.

[creikey]

In my latest push I've incremented the core api version.

[karroffel]

That's not what I meant 😄 I meant that this entry for godot_array_slice needs to live inside core/next/next/api (The Core 1.2 extension) instead of the core/api where it is currently located.

[creikey]

Ahhh, ok 😆 sorry my bad. I've moved the slice json object into the core/next/next/api section in my latest force push and gotten rid of the change in the python script.

[KoBeWi]

If you are adding the documentation, the deep argument should be documented too. Also delta should be wrapped in [code] block.

[Calinou]

Would step be more appropriate than delta as the name of the third parameter?

Also, using a delta of 0 should print an error message (if I'm reading the code right).

[creikey]

@Calinou I've changed the name of the argument to step as delta is used in _process, and added an error print if zero is given as a step.

@KoBeWi I've explained the deep argument in the docs and wrapped the delta now step in a code block

[akien-mga]

Why change the indentation?

[akien-mga]

The commit log should also be amended now that it's no longer bumping core version.

[creikey]

@akien-mga In my latest force push I've fixed getting rid of the indentation and ammended the commit log.

[akien-mga]

You're still changing the indentation, causing a diff while no actual change is made to the core definitions.

[creikey]

@akien-mga I see the issue now, it was not showing up in my editor very clearly. I need to increase tab size for json... it has been fixed in the latest force push.

[akien-mga]

Thanks!