use directory selection for demo-mode.


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4704 96b784f8-4ae3-dd11-aff7-0030488c597c
add support for reading vertex colors


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4705 96b784f8-4ae3-dd11-aff7-0030488c597c
found another data type - byte arrays. add support.


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4706 96b784f8-4ae3-dd11-aff7-0030488c597c
fix for various corner cases from testing more sample files.


git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4707 96b784f8-4ae3-dd11-aff7-0030488c597c