Port r9705 from zookeeper branch to trunk: Exposed a ship's autoaim FOV to Lua and allowed $Autoaim FOV to take floats rather than just ints.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9776 387891d4-d844-0410-90c0-e4c51a9137d3
Port r9723 from zookeeper branch to trunk: Made is-facing able to check for target objects other than ships.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9777 387891d4-d844-0410-90c0-e4c51a9137d3