Changed the process() method in resource manager to actually return the
resource content instead of a boolean which makes it slightly cleaner to
obtain a resource right after processing.
Added support for iOS launch images to iOS build tasks. Prepared and
added the most basic launch image formats so that they are included in
each Tetragon iOS build. They are just a black screen and therefore very
small (1.75Kb total, optimized with PNGOutWin).