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/M5stackCore2/Source/hal/Core2Display.cpp

@@ -102,7 +102,7 @@ bool Core2Display::start() {
 }
 
 bool Core2Display::stop() {
-    tt_assert(displayHandle != nullptr);
+    assert(displayHandle != nullptr);
 
     lvgl_port_remove_disp(displayHandle);