Update to use zig package manager

[deevus]

Changes:

• Removed raylib submodule
• Added build.zig.zon with raylib as dependency

Todo:

• Update JSON calls in generate.zig
• Update or remove addTo function
• Test adding as a dependency to a project

Fixes #14

[ryupold]

I haven't read into the documentation of the package manager yet.
Not sure if I manage to find time this week to look into it.
Probably next week.
At least I fixed the JSON parsing calls today.
Thanks for the preliminary work setting up the build.zig.zon

[deevus]

No problem.

I haven't read into the documentation of the package manager yet.

What documenation? 😅 I had a poke through the source code in addition to reading over @andrewrk's test repo here: https://github.com/andrewrk/ffmpeg

[gabstv]

Will this PR be reconsidered since the package manager is now supported in the latest stable release (0.11.x)?

[ryupold]

Yes, I just had not the time do it yet. I also want to integrate the webassembly build as package somehow but I dont know yet how to do that

[deevus]

Closing in favour of #38