Added tile edge menu popup. To get rid of the "Done" button, will need to implement a StayOpen property for the popup. Also need to implement Placement properties so the popup will correspond to mouse location.

The idea with "aTAMEdgeOptions" is that we should just be able to swap out options in the popup based on the current mode (aTAM, 2HAM, etc).

Added a color picker child window. Needs work, and haven't attached it to anything yet.

Simplified the SingleTile viewmodel.