Refactored the setup for MarkObjects (now renamed Markers) and made the CompoundMark + Mark + GeoPoint classes the standard across all classes instead of GateMark + SingleMark + Mark.

#refactor

src/main/java/seng302/visualiser/fxObjects/Marker.java

@@ -0,0 +1,19 @@
+package seng302.visualiser.fxObjects;
+
+import javafx.scene.paint.Paint;
+import javafx.scene.shape.Circle;
+
+/**
+ * Visual object for a mark.
+ */
+public class Marker extends Circle {
+
+    public Marker() {
+        super.setRadius(5);
+    }
+
+    public Marker(Paint colour) {
+        this();
+        super.setFill(colour);
+    }
+}