Native iPhone port of Factorio 2.0.77

Run the original macOS ARM64 game code on iOS:
- tools/retarget.py: header-only Mach-O retargeting to an iOS dylib
- platform/native: UIKit host and macOS API shims (AppKit for SDL's
  Cocoa backend, CoreGraphics displays, CoreAudio device, Metal device
  properties, Wuffs PNG decoding, Steam and peripheral stubs)
- touch, overlay, iOS keyboard and hardware keyboard input
- tools/build_native.py: build, sign, install, data copy, launch
- docs: build guide, controls, architecture

Also includes the earlier static-translation research (ARM64 -> WASM ->
native) under docs/research, runtime/, tests/ and tools/.

No game files are included; the build reads them from a local install.

tools/symbolize_native.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+"""Symbolize [fx-crash] lines from build/native/console.log against the original factorio.dSYM.
+
+Usage: python3 tools/symbolize_native.py [console.log]
+Factorio.dylib offsets map to the original executable's addresses as 0x100000000 + offset.
+"""
+import re
+import subprocess
+import sys
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parent.parent
+DSYM = Path.home() / ("Library/Application Support/Steam/steamapps/common/Factorio/"
+                      "factorio.app/Contents/MacOS/factorio.dSYM/Contents/Resources/DWARF/factorio")
+log = Path(sys.argv[1]) if len(sys.argv) > 1 else ROOT / "build/native/console.log"
+lines = [l.rstrip() for l in log.read_text(errors="replace").splitlines() if "[fx-crash]" in l]
+addrs = []
+for line in lines:
+    m = re.search(r"Factorio\.dylib\+(0x[0-9a-f]+)", line)
+    if m:
+        addrs.append(hex(0x100000000 + int(m.group(1), 16)))
+symbols = iter(subprocess.check_output(["atos", "-o", str(DSYM), "-arch", "arm64", "-l", "0x100000000", *addrs],
+                                       text=True).splitlines()) if addrs else iter(())
+for line in lines:
+    if "Factorio.dylib+" in line:
+        print(line.split("[fx-crash] ", 1)[1], "=>", next(symbols))
+    elif not re.search(r"\] x\d+ =", line):
+        print(line.split("[fx-crash] ", 1)[1])