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/TestListView.cpp

@@ -0,0 +1,44 @@
+#include "TestListView.h"
+#include "M5UnitTest.h"
+#include "UiScale.h"
+#include <tt_lvgl_toolbar.h>
+#include <tactility/lvgl_fonts.h>
+
+void TestListView::onStart(lv_obj_t* parent, AppHandle handle, M5UnitTest* app) {
+    app_ = app;
+
+    tt_lvgl_toolbar_create_for_app(parent, handle);
+
+    list_ = lv_list_create(parent);
+    lv_obj_set_width(list_, LV_PCT(100));
+    lv_obj_set_flex_grow(list_, 1);
+    lv_obj_set_style_pad_all(list_, uiPad(), 0);
+    lv_obj_set_style_pad_row(list_, uiRowGap(), 0);
+    lv_obj_set_style_border_width(list_, 0, 0);
+    lv_obj_set_style_bg_opa(list_, LV_OPA_TRANSP, 0);
+
+    const lv_font_t* font = lvgl_get_text_font(uiFont());
+
+    for (int i = 0; i < UNIT_COUNT; i++) {
+        lv_obj_t* btn = lv_list_add_button(list_, UNIT_ICONS[i], UNIT_NAMES[i]);
+        lv_obj_set_user_data(btn, (void*)(intptr_t)i);
+        lv_obj_add_event_cb(btn, onBtnClicked, LV_EVENT_CLICKED, this);
+        // lv_list_add_button creates: child 0 = icon label, child 1 = text label
+        lv_obj_t* textLbl = lv_obj_get_child(btn, 1);
+        if (textLbl) lv_obj_set_style_text_font(textLbl, font, 0);
+        lv_obj_t* iconLbl = lv_obj_get_child(btn, 0);
+        if (iconLbl) lv_obj_set_style_text_font(iconLbl, lvgl_get_shared_icon_font(), 0);
+    }
+}
+
+void TestListView::onStop() {
+    list_ = nullptr;
+    app_  = nullptr;
+}
+
+void TestListView::onBtnClicked(lv_event_t* e) {
+    auto* self = static_cast<TestListView*>(lv_event_get_user_data(e));
+    lv_obj_t* btn = static_cast<lv_obj_t*>(lv_event_get_target(e));
+    int idx = (int)(intptr_t)lv_obj_get_user_data(btn);
+    if (self && self->app_) self->app_->showTest(idx);
+}