Add GPIO app and update CI (#5)

Apps/GPIO/main/Source/Application.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include "tt_app.h"
+#include "tt_mutex.h"
+#include "tt_timer.h"
+
+#include <lvgl.h>
+#include <vector>
+
+class Application final {
+
+    std::vector<lv_obj_t*> pinWidgets;
+    std::vector<bool> pinStates;
+    TimerHandle timer;
+    MutexHandle mutex;
+
+    static lv_obj_t* createGpioRowWrapper(lv_obj_t* parent);
+    static void onTimer(void* parameter);
+
+public:
+
+    void onCreate(AppHandle app);
+    void onDestroy(AppHandle app);
+    void onShow(AppHandle context, lv_obj_t* parent);
+    void onHide(AppHandle context);
+
+    void startTask();
+    void stopTask();
+
+    void updatePinStates();
+    void updatePinWidgets();
+};