Fix ThreeDimensionalViewer centering the camera improperly
Support lighting flag in OldSceneryVertex
Add OldModelEntry
Add OldEntityEntry
Scale 3D viewer zoom speed with the model's size
Invalidate display at the end of ResetCamera
Make 3D viewer controls smoother
Optimize OldSceneryEntryViewer with display lists
Check Entity propertycount to avoid overflow
Implement saving of Old Scenery Entries
Expose unknown properties in OldSceneryPolygon