Add command-line parser

Xrayez commented 3 years ago

Port of godotengine/godot#44594 to Godot 3.x to be available in Goost, with another bulk of changes and enhancements.

Co-authored-by: https://github.com/Shatur and https://github.com/lupoDharkael, thanks for the work on this as well, it would be too bad for such a feature to remain in the Limbo.

To-do

[x] Further review, adapt and refine implementation.
- [ ] Checkers used Callable, which is not present in Godot 3.x decided not to implement for now, see d074e05 (#123).
- [x] Automatically use default help format.
[x] Port/write unit tests in GDScript.
[x] Improve documentation.

Xrayez commented 3 years ago

I feel like current implementation and API is fine.

So lets merge this and make it go through https://github.com/goostengine/goost-fuzzer to reveal potential crashes in gd3 branch.

Thanks for providing implementation and going through review process, hopefully we have consensus here. 🙂

Shatur commented 3 years ago

Thanks for providing implementation and going through review process, hopefully we have consensus here. 🙂

You are welcome :)