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/cli/show_face.zig

@@ -7,6 +7,7 @@ const diagnostics = @import("diagnostics.zig");
 const font = @import("../font/main.zig");
 const configpkg = @import("../config.zig");
 const Config = configpkg.Config;
+const global = @import("../global.zig");
 
 pub const Options = struct {
     /// This is set by the CLI parser for deinit.
@@ -62,15 +63,15 @@ pub const Options = struct {
 ///     style. Valid options are `text` and `emoji`. If unset, the presentation
 ///     style of a codepoint will be inferred from the Unicode standard.
 pub fn run(alloc: Allocator) !u8 {
-    var iter = try args.argsIterator(alloc);
+    var iter = try args.argsIterator(alloc, global.args());
     defer iter.deinit();
 
     var stdout_buffer: [1024]u8 = undefined;
-    var stdout_writer = std.fs.File.stdout().writer(&stdout_buffer);
+    var stdout_writer = std.Io.File.stdout().writer(global.io(), &stdout_buffer);
     const stdout = &stdout_writer.interface;
 
     var stderr_buffer: [1024]u8 = undefined;
-    var stderr_writer = std.fs.File.stdout().writer(&stderr_buffer);
+    var stderr_writer = std.Io.File.stdout().writer(global.io(), &stderr_buffer);
     const stderr = &stderr_writer.interface;
 
     const result = runArgs(