Add support for retrieving scene nodes from a scene by name.

Scene nodes do not need unique names, so this system simply returns the first occurrence.
Add the ability to retrieve the transformation of a bone via scripting.

This allows scripts to attach objects to bones.
Add more ways of accessing bones from a model.
Change a link in the about dialog box.
A tiny cleanup to the scene editor.
Add support for Colour and Alpha over Time particle functions.
Have the default renderer use the specular power channel of materials.
Fix a bug where an empty material file could cause a crash.
Add support for creating a new material and particle system from the asset explorer.