adding support for AppendTimecodeSlot
added timecode object
added WAVE, AIFC and TIFF descriptors
added SourceRef Object and added new_phys_source_ref
add_pulldown cleanup
name not required for MasterMob and CompositionMob
added new_phys_source_ref method
added Filler Initialize
added create sequence test
exposed more mob methods
added more declares
adding varyingValue methods
adding retime test
added ParametersHelper
added __getitem__ to base iterator
added reset to iterators
added __len__ to base iterator
added clone to iterators
fixed iterator len and getitem
cleanup