Texture updates match skin colors/style

New smaller (file size) and matching color/styles to skin.

* OSDProgress/Back/Mid/Light which covers all UI volume/progress bars
* ScrollbarH/H_bar/H_bar_focus which covers all Horizontal scrollbars
* ScrollbarV/V_bar/V_bar_focus which covers all Vertical scrollbars
* Floor Which covers main menu and other views (is same texture as when
pulling osd it improves visibility of background and improves matching
style.

I can upload a Textures.xbt for testing if anyone wants, just ask and
shall be done.