Code style: Move all the if-else starting curly brackets to their own line.

This is my usual coding style/format. I was using the other one to
save some space with short if-else bodies, but I guess consistency
would be better.
Implement the circular motion mode.

It works correctly, but the rotation changes make the camera
very jittery and annoying to watch, if using a target point that
causes big changes to the rotation per game tick.
Don't render the path markers if Multishot GUI or Minecraft GUI is hidden.