basic i/o access are performed with FreeType 2.
Note that unlike FT 1.x, you don't need to recompile the library if
you want to provide your own memory manager or your own i/o streams.
also, changed all image references to the new PNGs
Note that this document is really out-of-date
(there are no more resources, the stream manager has disappeared,
the build systel was seriously modified, etc..)