Console renderer improvements

Added console renderer public properties for configuring style
FileSystemAssetSource logging

Added logging to FileSystemAssetSource for debugging file path
resolving.
StaticAssetLoader logging

Added logging to StaticAssetLoader for debugging
Documentation

UniformBoundingHierarchy xmldoc
Gui Components

- New GuiScenegraph demo project.
- New ImageWidgetComponent.
- GuiWindow uses Alpha instead of RenderBackground.
- Alpha now defaults to 1.0f.
- Added HorizontalCrop and VerticalCrop properties to Image.