refactor: clean up code to py39+ supported syntax
- f-strings instead of format
- latest typing support instead of pre 3.9 TitleCase
- remove UTF-8 declarations.
- many more changes
Powered by https://github.com/asottile/pyupgrade/ + manual cleanups
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
* feat(control): Add Table MultiSelect control
* fix: Use btn-group instead of span
* fix: Remove functionality
* fix: Add 'Table MultiSelect' to Field doctypes
* fix: Replace usage of string 'Table' with array `table_fields`
* fix: Use internal array to store values instead of building from HTML elements
* fix(style): Add semicolon
* fix: Read only mode and click to navigate to form
* style: indent
* fix: fallback to empty array
* fix: Add formatters in js and py
* style: missing semicolon
* fix: Add docfield validation
