Make various functions more efficient.

[luciansmith]

In particular:

• The colors list was being constantly copied everywhere. Now it's never copied at all.
• Any time a set position or size function was called, the curves were always updated a la autolayout. It's still possible to move things with that functionality, but by default, it no longer does this.

[luciansmith]

OK, I addressed your requests!

• Added new issue here for putting back in the 'round' function. However, I can say that the old system wasn't actually working as advertised; I always got non-rounded versions of almost every value even before this PR.
• Changed the default updateCurves value to true.
• Put in a new design in the Python bindings that just uses the 'colorData' function. It might not work yet. But once 'colorData' returns a python dictionary (which it should be able to do) everything else will work. Also, I renamed the functions, since they weren't always returning lists, and they weren't returning 'all valid' values, but rather the predefined values. Unpredefined hex values are still legal.