Fixes and new apps (#30)

- M5 Unit Modules library + M5 Unit Test app
- Minor fixes for TodoList, TwoEleven, Snake, Brainfuck and Breakout
- Fixed SerialConsole to use the uart controller as it was broken in one of the many updates
- Fixed keyboard input in TwoEleven, Breakout, Magic8Ball and Snake
- Bluetooth Media Keys app, supports pressing physical keys to trigger the corresponding buttonmatrix button
- Epub Reader app

Apps/M5UnitTest/main/Source/M5UnitTest.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <tt_app.h>
+#include <lvgl.h>
+#include <TactilityCpp/App.h>
+
+// Forward declarations for test views
+class TestListView;
+class TestViewBase;
+
+class M5UnitTest final : public App {
+public:
+    void onShow(AppHandle handle, lv_obj_t* parent) override;
+    void onHide(AppHandle handle) override;
+
+    // Called by TestListView when user selects a unit to test
+    void showTest(int unitIndex);
+    // Called by test views when user presses back
+    void showList();
+    // Called by the Back button path after the view has already been deleted
+    void clearActiveTestView() { activeTestView_ = nullptr; }
+
+    AppHandle getAppHandle() const { return appHandle_; }
+
+private:
+    AppHandle     appHandle_       = nullptr;
+    lv_obj_t*     wrapper_         = nullptr;  // full-screen container, cleaned between views
+    TestListView* listView_        = nullptr;
+    TestViewBase* activeTestView_  = nullptr;
+
+    static M5UnitTest* s_instance;
+
+    void createWrapper(lv_obj_t* parent);
+};