scRollers

• sliderBox();
• Renamed slider() to sliderField()
• Vertical sliderBox (sliderBoxV());
• offsetGroup() element;
• scrollable() element;
• scrollablePanel() element;
• window() element;
• scrollableWindow() element;
• Group element spacing now is customizable through styles;
• Improvements on documentation
• Groups now call end() on destruction, if needed;
• Fix Bug on Wrapper move operations;
  • It was accessing invalid memory
• Organize source files into include;