Fixed opacity brush rendering:

 - Element render transforms no longer affect opacity brushes
 - Special opacity handling in brushes no longer required
 - Effects and opacity brushes can now be used together
Removed using(Surface) as it leads to unwanted disposal of resources we did not create ourselves
Added glow image from Titan; Using rounded OpacityMask for home buttons; Tweaked label position
Optimized StretchRect call to copy only control bounds