C++ conversion (#80)

Converted project to C++

Tactility/Private/App_i.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "App.h"
+
+#include "AppManifest.h"
+#include "Mutex.h"
+
+namespace tt {
+
+class AppData {
+public:
+    Mutex* mutex;
+    const AppManifest* manifest;
+    AppState state = AppStateInitial;
+    /** @brief Memory marker at start of app, to detect memory leaks */
+    size_t memory = 0;
+    AppFlags flags = {
+        .flags = 0
+    };
+    /** @brief Optional parameters to start the app with
+     * When these are stored in the app struct, the struct takes ownership.
+     * Do not mutate after app creation.
+     */
+    Bundle parameters;
+    /** @brief @brief Contextual data related to the running app's instance
+     * The app can attach its data to this.
+     * The lifecycle is determined by the on_start and on_stop methods in the AppManifest.
+     * These manifest methods can optionally allocate/free data that is attached here.
+     */
+    void* _Nullable data = nullptr;
+};
+
+} // namespace