Cleanup interface of freeTypeLibrary_c: Reduce FT dependencies to a minimum
Cleanup interface of textLayout_c: Make type of glyphIndex independent from FT

This needs a cast for PugiXML because PugiXML has no propert support
for long ints.
Move FT dependencies from STLL header into the implementation files that acutally use FT
Merge pull request #19 from vog/improve-layouter-font-interface

Finish interfaces improvements regarding FT