Provide Linux/MacOS support.

[VictosVertex]

The current clingo-language.so is compiled for windows, thus it doesn't work on either Linux or MacOS.

As of now I don't know what's better:

1. compile the files for each target and include them in the git repo directly
2. create github actions to compile all targets and create a script that downloads the correct one based on the user's system
3. let the user compile the file

My current thoughts:

1. Is easier, but usually binaries are not included in git. Here I initially made an exception since the grammar shouldn't change all that frequently.
2. is the usual and cleaner way, I think, but requires somewhat more setup and a script or manual downloads by the user.
3. I don't really like the user experience of this. but maybe that's just me.

I tend towards removing the current .so and instead following 2.