Implement Cloneable for all primitive wrappers

imgui-binding/src/main/java/imgui/ImVec2.java

@@ -5,13 +5,18 @@ import java.util.Objects;
 /**
  * 2D vector (often used to store positions or sizes)
  */
-public final class ImVec2 {
+public final class ImVec2 implements Cloneable {
     public float x;
     public float y;
 
     public ImVec2() {
     }
 
+    public ImVec2(final ImVec2 imVec2) {
+        this.x = imVec2.x;
+        this.y = imVec2.y;
+    }
+
     public ImVec2(final float x, final float y) {
         this.x = x;
         this.y = y;
@@ -41,4 +46,9 @@ public final class ImVec2 {
     public int hashCode() {
         return Objects.hash(x, y);
     }
+
+    @Override
+    public ImVec2 clone() {
+        return new ImVec2(this);
+    }
 }