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/classes/main.cpp

@@ -1,4 +1,5 @@
 #include "ClassA.h"
+#include <list>
 
 int main() {
     ClassA a;
@@ -25,6 +26,14 @@ int main() {
 
     ClassA a2 = a;
 
+    std::list<ClassA> l;
+    l.push_back(a);
+    l.push_back(a2);
+    l.push_back(*pA);
+    for (std::list<ClassA>::iterator it = l.begin(); it != l.end(); ++it) {
+        // (*it).Print();
+        it->Print(); // same as line above, but simpler
+    }
 
     return 0;
 }