Merge branch '13-abstract-sprite-class' into 'dev'

Resolve "Abstract Sprite Class"

See merge request !5

frontend/core/src/com/gameware/game/sprites/Sprite.java

+package com.gameware.game.sprites;
+
+import com.badlogic.gdx.math.Vector2;
+
+public abstract class Sprite {
+
+    private Vector2 position;
+    private int width;
+    private int height;
+    private Object bounds;
+
+    public abstract void reset();
+    public abstract Object report();
+
+    public abstract void draw();
+
+}
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