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/TestUnitLcdGfx.h

@@ -0,0 +1,58 @@
+#pragma once
+#include "TestViewBase.h"
+#include <UnitLcd.h>
+#include <UnitPaHub.h>
+
+// PDQ graphics benchmark test, matching the Arduino_GFX PDQgraphicstest sketch.
+// Phases run sequentially via one-shot LVGL timers; results appear in the LVGL
+// log and are also drawn back onto the LCD unit at the end.
+class TestUnitLcdGfx final : public TestViewBase {
+public:
+    void onStart(lv_obj_t* parent, AppHandle handle, M5UnitTest* app) override;
+    void onStop() override;
+
+private:
+    UnitPaHub  hub_;
+    UnitLcd    lcd_;
+    bool       usingPaHub_ = false;
+
+    lv_obj_t*   lblPhase_  = nullptr;
+    lv_obj_t*   lblLog_    = nullptr;
+    lv_timer_t* timer_     = nullptr;
+
+    static constexpr int RESULT_COUNT = 15;
+
+    int      phase_    = 0;
+    char     logBuf_[768] = {};
+    uint32_t results_[RESULT_COUNT] = {};
+
+    // Pre-computed layout constants (set in onStart after lcd_.begin)
+    int16_t w_ = 0, h_ = 0;
+    int16_t minDim_ = 0, minDim1_ = 0;       // min(w,h) and min(w,h)-1
+    int16_t cx_ = 0, cy_ = 0, cx1_ = 0, cy1_ = 0;
+    int16_t cMin_ = 0, cMin1_ = 0;           // min(cx1,cy1) and min(cx1,cy1)-1
+
+    void selectIfNeeded();
+    void runNextPhase();
+    void appendLog(const char* name, uint32_t us);
+    void drawResultsOnLcd();
+
+    static void onTimer(lv_timer_t* t);
+
+    // Benchmark phases - matching PDQ order exactly
+    uint32_t testFillScreen();
+    uint32_t testText();
+    uint32_t testPixels();
+    uint32_t testLines();
+    uint32_t testFastLines();
+    uint32_t testFilledRects();
+    uint32_t testRects();
+    uint32_t testFilledTriangles();
+    uint32_t testTriangles();
+    uint32_t testFilledCircles();
+    uint32_t testCircles();
+    uint32_t testFillArcs();
+    uint32_t testArcs();
+    uint32_t testFilledRoundRects();
+    uint32_t testRoundRects();
+};