Add/remove things to bring over work from other project

In terms of “remove”, removed a lot of unused things from the “player”
- in particular, the box collider was intercepting clicks aimed at the
city, breaking the GUI trigger. It didn’t appear to be doing anything,
so I just took it out. Also removed unused mesh etc - looks like
someone just added some GameObject from the menu (not empty). Feel free
to add things back, but know that adding a collider (or possibly a
rigid body) will intercept clicks, which is not a great idea for
something invisible.
Merge branch 'Ace'