Also includes support for more than two mainhall resolutions, zooming
so one mainhall can adapt to multiple resolutions, setting new mainhall
fonts, help overlays for all resolutions and adjustable tooltip padding.
Also allows preload screens to be any resolution & aspect ratio.
git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10844 387891d4-d844-0410-90c0-e4c51a9137d3