modified the patch to store the string internally rather then an array of allocated string pointers, less hassle with memory allocation.
changed to use fnmatch, so *.foo is needed (not .foo as with the patch)
- made operator dir's into python packages
- lazy loading of module which do the actual import and export (faster blender load times)
- general maintanance and small fixes.
- bugfix for exporting x3d materials
- leak fix for exporting 3ds
