Use Units.gu for better scaling

Moved from hard values to Units.gu where possible to allow better
scaling on non-Tenderloin targets. I left the old font pixelsizes in
there for now as reference, because we might need to create some
additional refinements between medium and large sizes.
Fix spacing issues
More spacing fixes
Delete webosports-logo-glow.png
Delete webosports-logo-normal.png
Merge pull request #144 from Herrie82/master

Use Units.gu where possible to make scaling better