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

src/CMakeLists.txt

@@ -5,9 +5,23 @@ target_include_directories(fry_core PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 target_link_libraries(fry_core PUBLIC glm::glm libzstd_static)
 target_compile_definitions(fry_core PUBLIC GLM_ENABLE_EXPERIMENTAL)
 
-add_executable(fry3dx app.cpp icons.cpp)
+if(ANDROID) # SDL's Java side loads the app as libmain.so and calls its (SDL_)main
+  add_library(fry3dx SHARED app.cpp icons.cpp)
+  set_target_properties(fry3dx PROPERTIES OUTPUT_NAME main LIBRARY_OUTPUT_DIRECTORY ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
+else()
+  add_executable(fry3dx app.cpp icons.cpp)
+endif()
+if(WIN32) # a window program (no console window), with its icon
+  target_sources(fry3dx PRIVATE fry3dx.rc)
+  set_target_properties(fry3dx PROPERTIES WIN32_EXECUTABLE ON)
+  target_link_options(fry3dx PRIVATE /ENTRY:mainCRTStartup)
+endif()
 target_link_libraries(fry3dx PRIVATE fry_core keel stb)
 add_dependencies(fry3dx content)
 foreach(t fry_core fry3dx)
-  target_compile_options(${t} PRIVATE -Wall -Wextra -Wno-missing-field-initializers)
+  if(MSVC)
+    target_compile_options(${t} PRIVATE /W3)
+  else()
+    target_compile_options(${t} PRIVATE -Wall -Wextra -Wno-missing-field-initializers)
+  endif()
 endforeach()