fix outline styles (yaml parsing issue with ternary operator)
Merge branch 'master' into selection
add (but kept commented out) 32-bit color key for selection (as alternative to float key)
probably want to switch to color key once we have support to pack the 4 floats into 1,
but until then it wastes a lot of space in the GL buffer (4 components instead of 1), so keeping float for now