Update to Zig 0.16.0

This commit represents the majority of the work necessary to upgrade
Ghostty to use Zig 0.16.0.

Key parts:

* In addition to its previous responsibilities, the global state now
  houses state for global I/O implementations and the process
  environment. It is now also utilized in the main application along
  with the C library. Where necessary, global state is isolated from key
  parts of the implementation (e.g., in libghostty subsystems), and it's
  expected that this list will grow.

* We currently manage our own C translation layer where necessary. In
  these cases, cImport has been removed in favor of the new external
  translate-c package. Due to fixes that have needed be made to properly
  translate the dependencies that were swapped out, as mentioned, we
  have had to backport fixes from the current translate-c package (and
  the upstream Arocc dependency). We will host this ourselves until Zig
  0.17.0 is released with these fixes.

* Where necessary (only a small number of cases), some stdlib code from
  0.15.2 (and even from 0.17.0) has been taken, adopted, and vendored in
  lib/compat.

Co-authored-by: Leah Amelia Chen <hi@pluie.me>

src/main_build_data.zig

@@ -27,14 +27,14 @@ pub const Action = enum {
     terminfo,
 };
 
-pub fn main() !void {
+pub fn main(init: std.process.Init) !void {
     const alloc = std.heap.c_allocator;
-    const action_ = try cli.action.detectArgs(Action, alloc);
+    const action_ = try cli.action.detectArgs(Action, alloc, init.minimal.args);
     const action = action_ orelse return error.NoAction;
 
     // Our output always goes to stdout.
     var buffer: [1024]u8 = undefined;
-    var stdout_writer = std.fs.File.stdout().writerStreaming(&buffer);
+    var stdout_writer = std.Io.File.stdout().writerStreaming(init.io, &buffer);
     const writer = &stdout_writer.interface;
     switch (action) {
         .bash => try writer.writeAll(@import("extra/bash.zig").completions),