make pilots actually launch in vipers when going to space
remove DRADIS locs from player management if no vipers can be launched
make vipers and civs available again when removed or wiped
Merge pull request #45 from MaxPeck/pilots

We will need to keep an eye on how WipeDradis() works because we're relying on the references being encoded properly in JSON.NET to persist some of these changes.  That's a clever way of handling it from that level, though, and it results in far fewer lines of code, so I generally approve!