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/tests/CMakeLists.txt

@@ -6,10 +6,31 @@ enable_language(C CXX ASM)
 file(GLOB_RECURSE TEST_SOURCES CONFIGURE_DEPENDS ${PROJECT_SOURCE_DIR}/source/*.cpp)
 add_executable(AppModuleTests EXCLUDE_FROM_ALL ${TEST_SOURCES})
 
+if (NOT APPLE)
+    # Provides __wrap_read/write/close for the -Wl,--wrap= below (see Tactility/CMakeLists.txt
+    # for the canonical pairing of this file with those flags).
+    target_sources(AppModuleTests PRIVATE ${CMAKE_CURRENT_LIST_DIR}/../../../Tactility/Source/AppStdioWrap.cpp)
+endif ()
+
 target_include_directories(AppModuleTests PRIVATE ${DOCTESTINC})
 
 add_test(NAME AppModuleTests COMMAND AppModuleTests)
 
+# Matches app-module's own TT_APP_IO_WRAPS_STDIO (see Modules/app-module/CMakeLists.txt):
+# io.cpp calls __real_read/write/close() on non-Apple POSIX, so any final link of it needs
+# these wraps too, or those symbols go unresolved. The printf-family/getc-family flags are
+# needed for the same reason: AppStdioWrap.cpp compiles those __wrap_* functions unconditionally
+# on this platform (see its own #if guard), and they reference __real_vfprintf/fputs/fputc/
+# fgetc/fgets - those only exist once the matching --wrap flag is passed.
+if (NOT APPLE)
+    target_link_options(AppModuleTests PRIVATE
+        "-Wl,--wrap=read" "-Wl,--wrap=write" "-Wl,--wrap=close"
+        "-Wl,--wrap=printf" "-Wl,--wrap=fprintf" "-Wl,--wrap=vprintf" "-Wl,--wrap=vfprintf"
+        "-Wl,--wrap=puts" "-Wl,--wrap=fputs" "-Wl,--wrap=putchar" "-Wl,--wrap=fputc"
+        "-Wl,--wrap=getchar" "-Wl,--wrap=fgetc" "-Wl,--wrap=fgets"
+    )
+endif ()
+
 target_link_libraries(AppModuleTests PUBLIC
     TactilityKernel
     app-module