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/TestUnitMidi.h

@@ -0,0 +1,30 @@
+#pragma once
+#include "TestViewBase.h"
+#include <UnitMidi.h>
+
+class TestUnitMidi final : public TestViewBase {
+public:
+    void onStart(lv_obj_t* parent, AppHandle handle, M5UnitTest* app) override;
+    void onStop() override;
+
+private:
+    UnitMidi unit_;
+    lv_obj_t* lblStatus_  = nullptr;
+    lv_obj_t* lblChannel_ = nullptr;
+    lv_obj_t* lblProgram_ = nullptr;
+    uint8_t   channel_    = 0;
+    uint8_t   program_    = 0;
+    uint8_t   note_       = 60;  // middle C
+    bool      notePlaying_= false;
+
+    // UART device name for MIDI unit (adjust to match your board wiring)
+    static constexpr const char* UART_DEVICE = "uart1";
+
+    static void onNoteOnClicked(lv_event_t* e);
+    static void onNoteOffClicked(lv_event_t* e);
+    static void onChUp(lv_event_t* e);
+    static void onChDown(lv_event_t* e);
+    static void onProgUp(lv_event_t* e);
+    static void onProgDown(lv_event_t* e);
+    void updateLabels();
+};