FIX: extra-ddl can contribute to "drop-all" script, otherwise the drop all script is not appyable to h2:file (#1301)

src/main/java/io/ebeaninternal/extraddl/model/DdlScript.java

@@ -37,6 +37,8 @@ public class DdlScript {
   protected String name;
   @XmlAttribute(name = "platforms")
   protected String platforms;
+  @XmlAttribute(name = "drop")
+  protected boolean drop;
 
   /**
    * Gets the value of the value property.
@@ -98,4 +100,18 @@ public class DdlScript {
     this.platforms = value;
   }
 
+  /**
+   * Return if this a drop script.
+   */
+  public boolean isDrop() {
+    return drop;
+  }
+
+  /**
+   * Sets that this is a drop script.
+   */
+  public void setDrop(boolean drop) {
+    this.drop = drop;
+  }
+
 }