Fixed a FRED crash when using $Flight controls follow eyepoint orientation (patch by MageKing17).

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11163 387891d4-d844-0410-90c0-e4c51a9137d3
gr_opengl_string retooled to use glDrawArrays. Should be a bit faster now.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11165 387891d4-d844-0410-90c0-e4c51a9137d3