Add SFML project with Paddle class and miscellaneous utilities

- Introduced `Paddle` class for player controls in the SFML project.
- Added `main.cpp` to demonstrate basic paddle movement and rendering.
- Created reusable templates (`templates.h`) and inline class (`inlines.h`) in the `misc` module.
- Defined `structs`, `enums`, `unions` in `misc/structs_enums_unions.h`.
- Updated CMake configuration for the `sfml` and `misc` modules.
- Included new assets for backgrounds, characters, enemies, and tiles.

cpp/misc/templates.h

@@ -0,0 +1,28 @@
+//
+// Created by David Hackbarth on 27.02.26.
+//
+
+#ifndef MISC_TEMPLATES_H
+#define MISC_TEMPLATES_H
+
+template<class T>
+void safeDelete(T*& pObj)
+{
+    if (pObj != nullptr)
+    {
+        delete pObj;
+        pObj = nullptr;
+    }
+}
+
+template<typename T>
+class Node
+{
+public:
+    T data;
+    Node* next;
+
+    Node(T value) : data(value), next(nullptr) {}
+};
+
+#endif //MISC_TEMPLATES_H