Locations on a planet

[ben]

Planets have locations on them, but to make them double-clickable separately, they're actors of their own, and their tokens can be placed around the planets. In #244 we're adding token art that overlaps the neighboring hex, which assists with making the two feel connected. In addition, we'll need:

• A z-index control to make sure planets always render behind the other actors attached to them. We can borrow this idea from token-z, but it does mean depending on libwrapper. Planet z-index #246
• An easy way to rotate token art. Maybe it's easy to add a token HUD button? Easy buttons for token rotation #248
• Resizing token art on edit, and not just on creation. Update properly when editing a location #247

Mockup for nice-ish token art: