Improve odin bindings, DLL support

[jakubtomsu]

This PR does a number of modifications to the Odin binding generator, and the project structure:

• Add support for DLLs, using unity builds to compile all sokol libs into a single DLL (Windows only)
  • the primary reason for this is hot reloading
  • added sokol.c for unity builds
• Define the #config values as constants, so they can be easily used elsewhere
• Use a custom debug constant instead of ODIN_DEBUG (which is still used by default), which can override either all sokol libs or individual modules
• Add some empty lines to the generated bindings to improve readability :) (this is my personal preference, doesn't have anything to do with the rest of this PR)
• move the c folder which contains all C files and the build scripts into the sokol folder with odin packages. This means the sokol folder is now completely standalone and can be easily copied into the source directory of any project.

Most of these changes are what I used in my game Solar Storm. Sometimes it's just what I personally prefer, but I think it ultimately does make the bindings easier to work with.

Note: these changes are still a bit experimental as I couldn't test 100% everything before submitting the PR (like the automatic uploading of bindings on each commit).

[jakubtomsu]

Linked PR from the sokol-odin repo: floooh/sokol-odin#11

[jakubtomsu]

It's a pretty big PR, so in case you don't like something let me know

[floooh]

Looks good! I'll try to give it a whirl on the weekend before merging.

I was wondering why you moved the top-level scripts to build the C libraries into a subdirectory (because I preferred to have them visible at the top level), but this is a good reason:

This means the sokol folder is now completely standalone and can be easily copied into the source directory of any project.

PS: don't worry about the failed CI, I guess that's because the PR expects the new directory structure in sokol-odin.

[jakubtomsu]

Thank you! I agree the build scripts look nicer in the top-level folder, but this way just fits the odin workflow a bit better...

[floooh]

And merged. Many thanks!