Blender Git Loki

- Added Outliner selection

As a means to indicate items in the Outliner to do operations on, you can
select with RMB items. Works like FileSelect here. Since selection in
Outliner is only on outliner level, no further UI updates happen. That is
reserved for LMB actions.

Implemented right now are only few operations... they can be called up with
the WKEY (the famous spare key :)
- if objects selected, a menu appears with choices
- if materials or textures selected, a meny appears to unlink them

If you make mixed or confusing selections you get a warning message.

TODO: add selection color in theme, and of course more operations.