Blender Git Loki

Splash: Increase contrast of build info text

Now uses "Text Selected" theme color of "Menu Back" widget colors. Also
repositioned text slightly to have same margin on top and right (measured
by eye ;) ).
Tested with all bundled themes (contrib and no-contrib) and worked fine.

Considering that different splashes may need different colors for
overlaid text, using theme color may not be the best solution. I would
like to try how this works before adding an ugly way to force a certain
text color though.
Also tried different approaches, but this one I find the least ugly :S

As far as longer term plans go, we wanted to get a redesigned multi-page
splash screen anyway. At this point we can rethink how splash colors work
in general (i.e. auto-contrast, own splash theme colors, etc).