Port r9725 from zookeeper branch: Added a Lua function for drawing offscreen indicators. Includes refactoring of some of HudGaugeOffscreen gauge code to separate the position finding and drawing logic.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9864 387891d4-d844-0410-90c0-e4c51a9137d3
Port r9728 from zookeeper branch: Made eyepoints match the orientation of their parent submodel.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9865 387891d4-d844-0410-90c0-e4c51a9137d3