Added convenience function to operators, 'as_keywords()', so operator settings can be passed directly to a function as keyword arguments.
The problem in this case was that dictionary access to operator properties was not returning rna-property defaults, so as_keywords() ensures all defaults are set.
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
