Added bignum module based on the fantastic bigz library.

[denise-amiga]

No description provided.

[seyhajin]

Thanks for your PR.
Does it only work on Linux?
Have you tested it on other platforms?

[denise-amiga]

I only have Linux, but I don't think there will be any problems compiling it on other platforms since the library is in C (not C++).
The only potential issue is the absence of a specific include/type on a particular platform.
Since I'm currently only a Linux user, I'm unfamiliar with other platforms, sorry.
I used that same library in BlitzMax for Windows before without any problems (without changing anything at all). I'm new to Wonkey, and to do the binding, I used the SDL module as a template (which is cross-platform, but much more complex). Since I noticed that the makefiles_"plataform".wx files weren't exactly the same, I only created the one I could test.
It's true I uploaded it too quickly, before it was finished; I apologize.

But I don't think there will be any problem making it cross-platform, finishing the Rational part (which I haven't included because I didn't need it for a project I'm currently working on), and adding the documentation to make it "perfect."
Any help is welcome :)

[seyhajin]

You can move this code directly into the bigz.wx, delete makefile.wx and makefile_linux.wx files and commit/push this change.

This will restart the CI, and we can check whether the module compiles on other platforms before merging it.