anim_utils uses dict.iteritems() and errors in Python 3

[chris-lesage]

Line 2329 of mgear/core/anim_utils.py

for frame, matchDict in matchMatrix_dict.iteritems():

Should be changed to:

for frame, matchDict in matchMatrix_dict.items():

Or, use a similar Python version check as utils.py on lines 115 to 119.

[miquelcampos]

Thanks for the heads up @chris-lesage I will check that