Texture updates to match skin colors/style

Progress-bar/Scrollbar texture updates
New smaller (file size) and matching color/styles to skin.

Files updated/improved?

* OSDProgress/Back/Mid/Light.png which covers all UI volume/progress
bars
* ScrollbarH/H_bar/H_bar_focus.png which covers all Horizontal
scrollbars
* ScrollbarV/V_bar/V_bar_focus.png which covers all Vertical scrollbars
* Floor.png Which covers main menu and other views (is same texture as
when
pulling osd it improves visibility of background and improves matching
style.

A Textures.xbt for testing if anyone wants,
https://github.com/uNiversaI/Test/raw/master/Textures.xbt