feat!: rewrite for Zig 0.12/0.13 - #28

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)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

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