Zig's new juicy main is here!

Zig 0.16 introduces a major change to the main function signature, offering three variants: no parameters, std.process.Init, and std.process.InitMinimal. The old methods of accessing environment variables (std.os.environ) and CLI arguments (std.os.argv) have been removed due to safety concerns around undefined values on non-Windows platforms. The new Init types provide safe access to environment variables, CLI arguments, allocators (GPA and arena), and IO implementations. InitMinimal offers basic environment and argument access, while the full Init type includes pre-configured allocators and IO, with different implementations depending on build mode and target platform.