Fry3DX 0.5: builds for Windows, Linux and Android, a phone layout, Apache 2.0

- Apache License 2.0
- Windows: cross-built with clang-cl (cmake --preset windows), a window
  program with its icon; Linux: a portable preset (SDL and the C++
  library inside); Android: android/build_apk.py makes the APK
- tools/package.py packs the downloads; a GitHub workflow builds all
  three and makes a release for a v* tag
- A phone layout (fry_touch, on by default on Android): the UI drawn
  bigger, panels when asked for, a bar of big buttons, one finger to
  turn the view, two to move and pinch, a long press for a right-click;
  files through the phone's file picker
- Settings and autosaves now in a Nexoniarz folder (copied over once)
- README rewritten, the website shows the downloads and the phone

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NMSrd5oe1GpUD7E6d825KP

cmake/toolchains/make-case-overlay.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+"""Writes a clang VFS overlay that makes the xwin CRT/SDK headers case-insensitive (Windows code
+includes <Winsock2.h>, <WinSock2.h>, <winsock2.h>... and Linux filesystems care)."""
+import json, os, sys
+
+root, out = sys.argv[1], sys.argv[2]
+dirs = ["crt/include", "sdk/include/ucrt", "sdk/include/um", "sdk/include/shared", "sdk/include/winrt"]
+
+def tree(path):
+    entries = []
+    for name in sorted(os.listdir(path)):
+        full = os.path.join(path, name)
+        if os.path.islink(full) and name.lower() == os.readlink(full).lower():
+            continue  # xwin's lowercase alias: the overlay covers every casing already
+        if os.path.isdir(full):
+            entries.append({"type": "directory", "name": name, "contents": tree(full)})
+        else:
+            entries.append({"type": "file", "name": name, "external-contents": os.path.realpath(full)})
+    return entries
+
+overlay = {"version": 0, "case-sensitive": "false", "overlay-relative": False,
+           "roots": [{"type": "directory", "name": os.path.join(root, d), "contents": tree(os.path.join(root, d))} for d in dirs]}
+tmp = out + f".{os.getpid()}"
+with open(tmp, "w") as f:
+    json.dump(overlay, f)
+os.replace(tmp, out)