Save viewer settings with project

[ericrosenbaum]

I think we should save these settings in the project file, and restore them on load:

• Camera position and zoom level
• Turbo mode setting
• 2D/3D mode (currently called 'parallel projection')
• Background color
• Grid color and interval

One reason for this is to make it so that when another person loads and runs your project, they see what you see when you saved it (rather than e.g. a confusing camera view inside the model).