Splines and using them for content generation

First of all I'd like to say I'm really enjoying the new Splines - I think they mostly work really well and are very easy to work with!

Having worked with them for a bit, I do have a few suggestions though:

SplineContainer

1. SplineContainer should have a "changed" method. This is because you usually want to use the container to properly take its transform into account, however if anything changes its underlying Spline - your "spline.changed" listener gets...

Splines and using them for content generation