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

Tests/SdkIntegration/main/Source/main.c

@@ -9,6 +9,8 @@
 #include <lvgl.h>
 #include <lvgl/widgets/toolbar.h>
 
+#include <greeting.h>
+
 #include <stdbool.h>
 
 static void create_widgets(lv_obj_t* parent, void* userData) {
@@ -16,7 +18,7 @@ static void create_widgets(lv_obj_t* parent, void* userData) {
     lv_obj_align(toolbar, LV_ALIGN_TOP_MID, 0, 0);
 
     lv_obj_t* label = lv_label_create(parent);
-    lv_label_set_text(label, "Hello, world!");
+    lv_label_set_text(label, SDK_TEST_GREETING);
     lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);
 }