added stl.py for parsing .stl
added stl.py for parsing .stl

tschmorleiz/amcat,amcat/amcat,tschmorleiz/amcat,amcat/amcat,amcat/amcat,amcat/amcat,tschmorleiz/amcat,tschmorleiz/amcat,amcat/amcat,tschmorleiz/amcat,amcat/amcat