feat!: rewrite for Zig 0.12/0.13

[tranzystorekk]

Description

Partially taken from #8

Change summary:

• zig-clap updated to 0.8.0, with necessary changes
• removed the main.zig test, the cli parser chokes on the args received from the test invocation itself, and arguably this test isn't that useful to begin with
• code in gen.zig adjusted for type casting breaking changes back from 0.11
• necessary build system changes for the new optimize terminology
• other build system changes re: imports and modules
• std.os -> std.posix rename
• {write,read}IntLittle functions now are called {write,read}Int and accept an endian argument

Motivation and Context

How Has This Been Tested?

zig build
zig build -Doptimize=ReleaseSafe
zig build --summary all test
# run the built linuxwave and compare output to 0.1.5

Screenshots / Logs (if applicable)

Types of Changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation (no code change)
• [ ] Refactor (refactoring production code)
• [ ] Other

Checklist:

• [x] My code follows the code style of this project.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[tranzystorekk]

Seems https://hub.docker.com/r/euantorano/zig from the Dockerfile is no longer active...

[tranzystorekk]

Added some compatibility changes so that we can build for both zig 0.12 and 0.13:

• use b.path() to specify module paths in build.zig
• bump zig-clap to 0.9.1
• gitignore .zig-cache/ as well