Update Cython 3 and Numpy 2

[fbordeu]

Update code to support python 3.13, numpy 1 and cython 3.
Update documentation with the new url of the project

[fbordeu]

@Maki4748 I was finally able to pass all the tests. Can you test on your side to see if it's good for you.

I had a lot of problems with the numpy 1 & 2 compatibility and the support for windows and linux these are my findings.

the size of np.dtype('int')
            np1  np2
on win     32    64
on linux   64    64 

the size of np.dtype('long')
            np1  np2
on win     32    32
on linux   64    64 

The names of the type and the sizes are not verry clear. I'm not verry proud of the code so dont hesitate to make comment on it.

[Maki4748]

@fbordeu Yeah, I figured we need to deal with this properly at some point, I tried around and since char, short, long and long long are basically just int with a different width, I changed it up to the proper c int types with defined width, and the tests at least on windows are passing.
Types like np.long should just get resolved to the platfrom specific implementation then hopefully anyway.

Could you merge this for now?
I'll rebase my code onto it and create a pull request then