Integrated the Environment Lighting Editor

Hooray a significant feature! I've added a new "Tools" menu to the main strip of WindViewer that adds the Environment Lighting Editor (http://i.imgur.com/x9c9zlX.png).

Make sure you open a *stage* first or else it won't do anything. This will be fixed once more of the original loading code is re-written but it will do for now.

You can currently view the Environment, Pale, Color, and Virt (skybox) settings for a DZS file. You can modify their values but not save them yet. Neat for inspections!