Add delete shape operation

src/main/java/ovh/gasser/newshapes/shapes/AbstractShape.java

@@ -8,8 +8,8 @@ import java.util.TreeMap;
 
 public abstract class AbstractShape implements Shape {
 
-    private Map<String, Attributes> attributes = new TreeMap<>();
-    private Rectangle bounds;
+    private final Map<String, Attributes> attributes = new TreeMap<>();
+    private final Rectangle bounds;
 
     AbstractShape() {
         this(null);

src/main/java/ovh/gasser/newshapes/shapes/SCollection.java

@@ -8,16 +8,17 @@ import ovh.gasser.newshapes.attributes.SelectionAttributes;
 import ovh.gasser.newshapes.util.Streamable;
 
 import java.awt.*;
+import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Spliterator;
 
 public class SCollection extends AbstractShape implements Streamable<Shape> {
     private final static Logger logger = LoggerFactory.getLogger(SCollection.class);
-    private final List<Shape> children;
+    private List<Shape> children;
 
     private SCollection(Shape... shapes) {
-        this.children = List.of(shapes);
+        this.children = new ArrayList<>(List.of(shapes));
     }
 
     @Override
@@ -58,6 +59,12 @@ public class SCollection extends AbstractShape implements Streamable<Shape> {
         return children.spliterator();
     }
 
+    public void remove(Shape s) {
+        if (!children.remove(s)) {
+            logger.error("Unable to delete shape: {}", s);
+        }
+    }
+
     @Override
     public String toString() {
         StringBuilder sb = new StringBuilder("SCollection{");