Blender Git Loki

Bugfix #5356

Outliner: the new 'restriction' options were drawn as buttons, and created
always even when not visible. Gave big slowdowns on large data sets.

Also: help lines were drawn as shorts, should be floats

Cannot fix: button coordinates are short by default still, giant outliner
data sets draw buttons in wrong location.

Did add nice feature though; on several events the outliner now is not
being re-built anymore, but redrawn only. I want to be a bit conservative
with it though... but it happens for:
- LMB drag to select items
- pageup/down, scrollwheel, mmb scroll
- search item
- show active item
- toggle selection
Makes a good difference :)