[OH-Dev] Replace controllers with helpers

[Rajesh Pradhan]

Hi,

I have replaced controllers with helpers and merged controllers.py with
helpers.py in the base directory of missions. However I had to omit the
call @mysite.base.decorators.unicodify_strings_when_inputted before
_geocode and cached_geocoding_in_json due to error!

Please review.

Thanks
Rajesh
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