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/inlines.h

@@ -0,0 +1,16 @@
+//
+// Created by David Hackbarth on 27.02.26.
+//
+
+#ifndef MISC_INLINES_H
+#define MISC_INLINES_H
+
+class Value {
+public:
+    Value(int val) : value(val) {} // implicit inline
+    int getValue() const { return value; } // implicit inline
+private:
+    int value;
+};
+
+#endif //MISC_INLINES_H