Update designs to account for current plan

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Now that we have a much better idea the way forward vis-a-vis these tickets after our meeting with Aaron, we'll need some new designs to work from. Open questions:

• Given that the user is going to be switching between Slices, Images, Shapes and Structures I feel like we might want to represent those objects visually so that we know which inspector to display.

• We need inspectors for:

  • Project settings?
  • Images
  • Slices
  • Shapes
  • Structures

• We also have the following visual modes we need some UI to switch between:

  • view slice + shape (2D)
  • view structure (3D)

• We need some visibility controls for hiding / showing with a lot of granularity

• We need spline / point controls for manipulating shapes ala nuke; probably hasn't changed much since the hackathon.