C++ conversion (#80)

Converted project to C++

Boards/M5stackShared/Source/m5stack_lvgl_touch.cpp

@@ -0,0 +1,29 @@
+#include "M5Unified.hpp"
+#include "lvgl.h"
+#include "TactilityCore.h"
+
+#define TAG "cores3_touch"
+
+static void touch_read_callback(TT_UNUSED lv_indev_t* indev, lv_indev_data_t* data) {
+    lgfx::touch_point_t point; // Making it static makes it unreliable
+    bool touched = M5.Lcd.getTouch(&point) > 0;
+    if (!touched) {
+        data->state = LV_INDEV_STATE_REL;
+    } else {
+        data->state = LV_INDEV_STATE_PR;
+        data->point.x = point.x;
+        data->point.y = point.y;
+    }
+}
+
+_Nullable lv_indev_t* m5stack_lvgl_touch() {
+    static lv_indev_t* indev = lv_indev_create();
+    LV_ASSERT_MALLOC(indev)
+    if (indev == nullptr) {
+        return nullptr;
+    }
+
+    lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER);
+    lv_indev_set_read_cb(indev, touch_read_callback);
+    return indev;
+}