Changed dictionary handling to reference a single group of dictionaries
as the modularization had caused some dictionaries to be over written by
duplicates during execution.
Fix for an introduced bug caused while fixing the double scene root
issue. also some changes to the longname custom property.
Merge pull request #150 from Ghostwalker71/fix/global_dictionary

Fix/global dictionary
Merge branch 'develop' of git@github.com:niftools/blender_nif_plugin.git into feature/BsShaderproperty
BsShaderProperty texture handler updates