Changed LightingEditor from being a UserControl to being its own Popup Form.
Added Tools/Environment Lighting Editor to allow access to the Popup form.
Exposed some variables from MainForm to be public (namely the room and stage list) until that is re-written to be less... crappy.
Added a dropdown to choose which stage.dzs the Environment Editor is looking in for chunks.
Rewrote DZS/R loading enough to load EnvR & Friend Chunks.