The license.txt file has been replaced with LICENSE for quite a while
now. INAL but it didn't seem accurate to say "hey, checkout license.txt
although there's no such file". Apart from this, there were
inconsistencies in the headers altogether...this change brings
consistency.
* Remove six for PY2 compatability since our dependencies are not, PY2
is legacy.
* Removed usages of utils from future/past libraries since they are
deprecated. This includes 'from __future__ ...' and 'from past...'
statements.
* Removed compatibility imports for PY2, switched from six imports to
standard library imports.
* Removed utils code blocks that handle operations depending on PY2/3
versions.
* Removed 'from __future__ ...' lines from templates/code generators
* Used PY3 syntaxes in place of PY2 compatible blocks. eg: metaclass
* [domainify] hide restrict to domain modules from modules page
* [minor] cleared the domainification cache and other minor fixes
* Update test_domainification.py
* [feature] domainify doctype, pages and roles
* [minor] added get active domain method to __init__
* [fixes] minor fixes in domainification and added test cases
* [minor] added checkbox-editor class to render the domains
* [minor] added checkbox_selector option
* [minor] added or_filters to filter restrict to domain doctype and roles
* [minor] fixed codacy errors
