* Moving appbuilder.xxx out of view files ands into app.py
* Pulled url map converters out into their own file
* Adding license blurb
* Linting
* Linting again...
* Re-enable pylint for superset/jinja_context.py
* Re-enable pylint for superset/sql_lab.py
* Re-enable pylint for superset/sql_parse.py
* Re-enable pylint for superset/exceptions.py
* Re-enable lint for superset/translations/utils.py
* Re-enable pylint for superset/views/schedules.py
* Re-enable pylint for superset/views/base.py
* Re-enable pylint for superset/views/log/views.py
* Re-enable pylint for superset/views/annotations.py
* black
* PR feedback, pylint, isort fixes
* Black, one more time...
* Move ungrouped-imports to a global disable
* add column to annotation model
* update migration file
* change to Text
* remove old migration file
* add migration file
* remove JSON
* add new column to view
* add comma back
* linting
* lint some more
* missing comma
* rename columns
* add degrade and new migration file
* update version
* fixe changed name
* remove json from list columns
* Adding annotations to backend
* Auto fetching Annotations on the backend
* Closing the loop
* Adding missing files
* annotation layers UI
for https://github.com/apache/incubator-superset/issues/3502
* a few fixes per code review.
- add annotation input sanity check before add and before update.
- make SelectAsyncControl component statelesis, and generic
- add annotation description in d3 tool tip
- use less variable to replace hard-coded color
