Dropshadows as a style value for themes

[Gustaf]

If we hade support for dropshadows on text, viewports and rectangles we could make nicer looking themes.

Variables for dropshadows could be blur(0-100), size(xy), position(from origin, x/y).

[Bilgus]

it'd be nice but we still have targets that are lucky to render flat text in a timely manner

[dconrad]

Maybe if it was enabled on a per-device basis, with the disabled devices ignoring the drop shadows in the theme file?