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.

platform/ios/project.yml

@@ -0,0 +1,56 @@
+name: FactorioPort
+options:
+  deploymentTarget:
+    iOS: '15.0'
+targets:
+  FactorioPort:
+    type: application
+    platform: iOS
+    sources:
+      - main.m
+    dependencies:
+      - framework: ../../build/rng/libfactorio_rng_ios.a
+        embed: false
+      - framework: ../../build/version/libfactorio_version_ios.a
+        embed: false
+      - framework: ../../build/map-header/libfactorio_map_header_ios.a
+        embed: false
+      - framework: ../../build/save-layout/libfactorio_save_layout_ios.a
+        embed: false
+      - framework: ../../build/target-deserialiser/libfactorio_target_ios.a
+        embed: false
+      - framework: ../../build/deserialiser/libfactorio_deser_ios.a
+        embed: false
+      - sdk: UIKit.framework
+      - sdk: UniformTypeIdentifiers.framework
+      - sdk: libz.tbd
+    settings:
+      base:
+        PRODUCT_BUNDLE_IDENTIFIER: local.factorio.rng-prototype
+        PRODUCT_NAME: FactorioPort
+        CLANG_ENABLE_OBJC_ARC: YES
+        GENERATE_INFOPLIST_FILE: YES
+        INFOPLIST_KEY_CFBundleDisplayName: Factorio Port Prototype
+        INFOPLIST_KEY_UIFileSharingEnabled: YES
+        INFOPLIST_KEY_LSSupportsOpeningDocumentsInPlace: YES
+        INFOPLIST_KEY_UILaunchScreen_Generation: YES
+        HEADER_SEARCH_PATHS:
+          - $(SRCROOT)/../../build/rng
+          - $(SRCROOT)/../../build/version
+          - $(SRCROOT)/../../build/map-header
+          - $(SRCROOT)/../../runtime
+          - $(SRCROOT)/../../third_party/wabt/wasm2c
+        LIBRARY_SEARCH_PATHS:
+          - $(SRCROOT)/../../build/rng
+          - $(SRCROOT)/../../build/version
+          - $(SRCROOT)/../../build/map-header
+          - $(SRCROOT)/../../build/save-layout
+          - $(SRCROOT)/../../build/target-deserialiser
+          - $(SRCROOT)/../../build/deserialiser
+        GCC_PREPROCESSOR_DEFINITIONS:
+          - $(inherited)
+          - WASM_RT_USE_MMAP=0
+          - WASM_RT_MEMCHECK_BOUNDS_CHECK=1
+        TARGETED_DEVICE_FAMILY: '1,2'
+        MARKETING_VERSION: '0.1.0'
+        CURRENT_PROJECT_VERSION: '5'