Fixes and improvements (#185)

- unPhone improvements related to power and boot (add boot count logging)
- Cleanup of Mutex acquire/release
- Removed `tt_assert()` in favour of `assert()`
- Fix sim build (likely failed due to migration of GitHub Actions to Ubuntu 24.04)

Boards/Simulator/Source/LvglTask.cpp

@@ -69,7 +69,7 @@ void lvgl_task_start() {
         nullptr
     );
 
-    tt_assert(task_result == pdTRUE);
+    assert(task_result == pdTRUE);
 }
 
 lv_disp_t* displayHandle = nullptr;