cannot run in Python pre 3.7.2 anymore

[bertsky]

With the recent additions, I get:

   File "/lib/python3.6/site-packages/ocrd_browser/util/config.py", line 5, in <module>
    from typing import List, Optional, OrderedDict as OrderedDictType
ImportError: cannot import name 'OrderedDict'

(This is Python 3.6.7 – typing.OrderedDict was only introduced in 3.7.2.)

How can we avoid this dependency?

[hnesk]

As this was only some experimental code for an idea of "autoconfiguration", I removed it for now

[bertsky]

Thanks!