[Bf-compositor] Node colors and Themes

[Jeroen Bakker]

Hi all,

just to inform you that there was an update for theming node colors. It 
is now possible to themes each node category. The default themes have 
been updated to mimic the behavior before the change. We have not 
updated the contrib-themes; they will show warnings.

The reason for this change is that the compositor now only draw the 
previews for input nodes, the other previews are hidden by default, but 
can still be made visible. Users did need a better visual guidance of 
the tree; so we added better theming options for the nodes.

I would suggest for theme-maintainers to update their themes and make 
use of these new options.

Regards,
Jeroen