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/include/app/manager.h

@@ -111,6 +111,23 @@ struct AppStreamBinding {
  */
 error_t app_manager_start_with_streams(const char* id, const struct AppStreamBinding* bindings, size_t binding_count, AppInstanceId* out_app_instance_id);
 
+/**
+ * Combines app_manager_start_for_result() and app_manager_start_with_streams(): starts @a id as
+ * a modal child of @a parent_instance_id (see app_manager_start_for_result()'s own doc for the
+ * result-delivery contract) with @a bindings installed into its fd table before its task begins
+ * executing (see app_manager_start_with_streams()'s own doc for stream ownership). For a child
+ * that needs to hand back more than an int32_t (e.g. a path) via its own stdout instead of the
+ * "get last result" getter pattern (see app_manager_start_for_result()) - see e.g.
+ * tt::app::fileselection::startForExistingFile().
+ * @param[in] argv see app_manager_start_for_result().
+ * @param[in] bindings see app_manager_start_with_streams().
+ * @retval ERROR_NOT_FOUND no manifest with this id is registered, or no AppLoaderApi is registered
+ * @retval ERROR_OUT_OF_RANGE a binding's producer_fd is out of range
+ * @retval ERROR_RESOURCE a binding's event_group has no free bits left to claim
+ * @retval ERROR_NONE on success
+ */
+error_t app_manager_start_for_result_with_streams(const char* id, AppInstanceId parent_instance_id, int argc, const char* const argv[], const struct AppStreamBinding* bindings, size_t binding_count, AppInstanceId* out_app_instance_id);
+
 /**
  * Stop an app instance permanently. Emits APP_EVENT_CLOSE and bound-waits for its task to exit
  * if it was running.