* Development 15 | Experimental 1 *

* Added GUISlider
* Added GUIRenderableSlider
* Added GUIImageSlider
* Added GUISliderBuilder
* Added SliderTest
* Added ScrollEvent
* Added the method onScroll() to InputListener
* Added scrolling events

* Created package org.simplecorporation.myengine.core.gui.slider

* Fixed bug: Current position of mouse not set when not using OpenGL and
mouse clicked