use inner interface instead of default impl so we can go back to java 7 :) (close #87)

pom.xml

@@ -36,8 +36,8 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.2</version>
 				<configuration>
-					<source>1.8</source>
-					<target>1.8</target>
+					<source>1.7</source>
+					<target>1.7</target>
 					<encoding>UTF-8</encoding>
 				</configuration>
 			</plugin>

src/awlex/ospu/polymover/factory/PolyMoverFactory.java

@@ -13,7 +13,7 @@ import java.util.List;
 /**
  * Created by Awlex on 18.11.2016.
  */
-public abstract class PolyMoverFactory implements MoverFactory {
+public abstract class PolyMoverFactory implements MoverFactory, MoverFactory.MultiPoint {
 
 	private LinkedList<PolyMover> movers;
 	private int latestIndex;
@@ -47,11 +47,6 @@ public abstract class PolyMoverFactory implements MoverFactory {
 		throw new UnsupportedOperationException("Polymovers should use the create variant with all the gameobjects + startindex");
 	}
 
-	@Override
-	public boolean isMultiPoint() {
-		return true;
-	}
-
 	public final void create(GameObject[] objects, int startIndex) {
 		if (latestIndex <= startIndex) {
 			movers.clear();

src/yugecin/opsudance/Dancer.java

@@ -160,7 +160,7 @@ public class Dancer {
 		}
 		this.moverFactoryIndex = moverFactoryIndex;
 		moverFactory = moverFactories[moverFactoryIndex];
-		multipoint = moverFactory.isMultiPoint();
+		multipoint = moverFactory instanceof MoverFactory.MultiPoint;
 		// to prevent crashes when changing mover in storyboard, create mover now
 		createNewMover();
 	}

src/yugecin/opsudance/movers/factories/MoverFactory.java

@@ -24,8 +24,8 @@ public interface MoverFactory {
 
 	Mover create(GameObject start, GameObject end, int dir);
 
-	default boolean isMultiPoint() {
-		return false;
+	interface MultiPoint {
+
 	}
 
 }