Implement posix app loading (#643)

- Added POSIX desktop support for SDK builds, application packaging, and integration testing.
- Added POSIX filesystem partitions and improved application path handling.
- Added simulator support for loading and running applications dynamically.
- Improved simulator task stack handling and display startup reliability.
- Improved simulator display scaling, resizing, high-DPI support, and pointer accuracy.
- Fixed LVGL timers and input polling on POSIX. (fixes simulator with Linux on some Intel graphics platforms)
- Standardized data paths across platforms.
- Logging now works via separate task: this allows apps to write to log without it affecting their stdout (for apps that output text as relevant date for other apps, like the File Selection app)
- Fixes for app stdio

Modules/app-module/CMakeLists.txt

@@ -10,3 +10,12 @@ tactility_add_module(app-module
     INCLUDE_DIRS include/
     REQUIRES TactilityKernel service-module minitar
 )
+
+# Tells source/io.cpp its real-syscall fallback must go through __real_read/write/close()
+# rather than calling ::read/::write/::close() directly, on every platform whose build wraps
+# those symbols (ESP-IDF always; POSIX except macOS, whose linker doesn't support --wrap) -
+# see Tactility/CMakeLists.txt and the top-level CMakeLists.txt for where that's applied.
+if (NOT APPLE)
+    tactility_get_module_name(app-module MODULE_NAME)
+    target_compile_definitions(${MODULE_NAME} PRIVATE TT_APP_IO_WRAPS_STDIO)
+endif ()