Refactor app loading and window management (#609)

Tactility/Source/lvgl/Statusbar.cpp

@@ -133,7 +133,7 @@ static void statusbar_constructor(const lv_obj_class_t* class_p, lv_obj_t* obj)
 
     if (!statusbar_data.time_update_timer->isRunning()) {
         statusbar_data.time_update_timer->start();
-        system_event_subscribe(KERNEL_EVENT_TIME_CHANGED, onTimeChanged, nullptr);
+        system_event_callback_add(KERNEL_EVENT_TIME_CHANGED, onTimeChanged, nullptr);
     }
 }
 

Tactility/Source/lvgl/Toolbar.cpp

@@ -1,10 +1 @@
 #include <Tactility/lvgl/Toolbar.h>
-#include <Tactility/app/AppManifest.h>
-
-namespace tt::lvgl {
-
-lv_obj_t* toolbar_create(lv_obj_t* parent, const app::AppContext& app) {
-    return lvgl_toolbar_create(parent, app.getManifest().appName.c_str());
-}
-
-} // namespace