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/structs_enums_unions.h

@@ -0,0 +1,49 @@
+//
+// Created by David Hackbarth on 27.02.26.
+//
+
+#ifndef MISC_STRUCTS_ENUMS_UNIONS_H
+#define MISC_STRUCTS_ENUMS_UNIONS_H
+
+#include <iostream>
+
+struct Vector3 {
+    // public
+    float x, y, z;
+
+    bool operator==(const Vector3 &other) const { return x == other.x && y == other.y && z == other.z; }
+    bool operator!=(const Vector3 &other) const { return !(*this == other); }
+    bool operator<(const Vector3 &other) const { return x < other.x && y < other.y && z < other.z; }
+    bool operator<=(const Vector3 &other) const { return *this < other || *this == other; }
+    bool operator>(const Vector3 &other) const { return !(*this <= other); }
+    bool operator>=(const Vector3 &other) const { return !(*this < other); }
+
+private:
+    // private
+};
+
+std::ostream& operator<<(std::ostream& os, const Vector3& v) {
+    os << "(" << v.x << "/" << v.y << "/" << v.z << ")";
+    return os;
+}
+
+enum Weekdays {
+    Monday = 1, Tuesday = 2, Wednesday = 3, Thursday = 4, Friday = 5, Saturday = 6, Sunday = 7,
+
+    FORCE_DWORD = 0x7fffffff // DWORD -> double word -> unsigned 32bit, word -> unsigned 16bit
+};
+
+union ScreenSize {
+    unsigned int value; // 32bit
+    struct {
+        unsigned short width; // first 16bit
+        unsigned short height; // second 16bit
+    } u;
+
+    struct {
+        unsigned short width; // first 16bit
+        unsigned short height; // second 16bit
+    } _;
+};
+
+#endif //MISC_STRUCTS_ENUMS_UNIONS_H