Interactive Furniture (0.9.0 Alpha)

This update adds interactive furniture capability and completes the fireplace furniture item.  Furniture can be activated using a new GUI tool found in the misc. tab of the block chooser dialog box.

As you can see in the animated gif, the fireplace now starts out with unburned logs, then becomes lit when switched on and when switched off goes to burned logs.  After that it just goes back and forth between burned logs and lit.  It now uses it's full set of animation frames, as well.