One of the pain points in developing Superset frontend code is the lack
of testing data. Local installation often do not have enough examples
setup to test all edge cases.
This change allows `webpack-dev-server` to proxy to any remote Superset
service, but the same time replaces frontend asset references in HTML
with links to local development version. This allows developers to test
with production data locally, tackling edge cases all while maintaining
the productivity of editing the code locally.
* First cut at app factory
* Setting things back to master
* Working with new FLASK_APP
* Still need to refactor Celery
* CLI mostly working
* Working on unit tests
* Moving cli stuff around a bit
* Removing get in config
* Defaulting test config
* Adding flask-testing
* flask-testing casing
* resultsbackend property bug
* Fixing up cli
* Quick fix for KV api
* Working on save slice
* Fixed core_tests
* Fixed utils_tests
* Most tests working - still need to dig into remaining app_context issue in tests
* All tests passing locally - need to update code comments
* Fixing dashboard tests again
* Blacking
* Sorting imports
* linting
* removing envvar mangling
* blacking
* Fixing unit tests
* isorting
* licensing
* fixing mysql tests
* fixing cypress?
* fixing .flaskenv
* fixing test app_ctx
* fixing cypress
* moving manifest processor around
* moving results backend manager around
* Cleaning up __init__ a bit more
* Addressing PR comments
* Addressing PR comments
* Blacking
* Fixes for running celery worker
* Tuning isort
* Blacking
