* Refactor type checks defined in APIs
* Remove dead/deprecated kwargs usages
* Added appropriate hints to APIs and consecutive utils defined in the following modules:
- frappe.realtime
- frappe.translate
- frappe.utils.global_search
- frappe.www.third_party_apps
- frappe.www.search
- frappe.www.printview
* 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
* [docs-portal] search documentation
* [doc-search] remove search-result template
* [portal-search][minor] add search result section title
* [portal-search] make search result section macro
* [portal-search] two-col layout for more sections