Develop Varied Camera Images

[milo-trujillo]

This is a component of issue #15. We need to replace our camera "map marker" with four markers, depending on the type of camera represented. Specifically, we need:

• Unknown (can re-use the current map-marker design)
• Fixed
• Panning
• Dome

The new images should have a similar colorscheme / look and feel that fits the rest of the app, and should be the same size as one another.