Simplify app registration with TactilityCpp (#7)

- Simplified app registration with a C++ wrapper for the TactilityC.
- Rename the various app classes from `Application` to more specific names like `Calculator` etc.

Libraries/TactilityCpp/Include/TactilityCpp/App.h

@@ -0,0 +1,65 @@
+#pragma once
+
+#include <concepts>
+#include <tt_app.h>
+
+class App {
+public:
+    virtual void onCreate(AppHandle app) {}
+    virtual void onDestroy(AppHandle app) {}
+    virtual void onShow(AppHandle context, lv_obj_t* parent) {}
+    virtual void onHide(AppHandle context) {}
+    virtual void onResult(AppHandle app, void* _Nullable data, AppLaunchId launchId, AppResult result, BundleHandle resultData) {}
+};
+
+template <typename T>
+concept AppClass = std::is_base_of<App, T>::value;
+
+template<AppClass T>
+void onAppCreate(AppHandle app, void* _Nullable data) {
+    static_cast<T*>(data)->onCreate(app);
+}
+
+template<AppClass T>
+void onAppDestroy(AppHandle app, void* _Nullable data) {
+    static_cast<T*>(data)->onDestroy(app);
+}
+
+template<AppClass T>
+void onAppShow(AppHandle context, void* _Nullable data, lv_obj_t* parent) {
+    static_cast<T*>(data)->onShow(context, parent);
+}
+
+template<AppClass T>
+void onAppHide(AppHandle context, void* _Nullable data) {
+    static_cast<T*>(data)->onHide(context);
+}
+
+template<AppClass T>
+void onAppResult(AppHandle app, void* _Nullable data, AppLaunchId launchId, AppResult result, BundleHandle resultData) {
+    static_cast<T*>(data)->onResult(app, data, launchId, result, resultData);
+}
+
+template<AppClass T>
+void* createAppData() {
+    return new T();
+}
+
+template<AppClass T>
+void destroyAppData(void* appData) {
+    auto* app = static_cast<T*>(appData);
+    delete app;
+}
+
+template<AppClass T>
+void registerApp() {
+    tt_app_register((AppRegistration) {
+        .createData = createAppData<T>,
+        .destroyData = destroyAppData<T>,
+        .onCreate = onAppCreate<T>,
+        .onDestroy = onAppDestroy<T>,
+        .onShow = onAppShow<T>,
+        .onHide = onAppHide<T>,
+        .onResult = onAppResult<T>
+    });
+}