Specifically:
1. Factored out color exporting.
2. Switched floating point writing to use .format() with 6 digits
of precision. The main gain here is that numbers like 1.0
don't print with a bunch of useless trailing zeros.
All scene data collection is now done in a single sweep of frame
changing. Previous commits were already working towards this, and
but now it's done. Yay!
Over-all, switching to this approach gives huge speed boosts on
large scenes with animation, rigs, dependencies, etc. For such
scenes, frame changing is very expensive.
This eliminates writing temp files to disk for any part of the
Blender/Psychopath integration.
The option to export to a file still exists, however, by
specifying an export output path.
