1.25.0

Improvements to Piccolo app creation. When running the following:

piccolo app new my_app

It now validates that the app name (my_app in this case) is valid as a Python package.

Also, there is now a --register flag, which automatically adds the new app to the APP_REGISTRY in piccolo_conf.py.

piccolo app new my_app --register

Other changes:

• table_finder can now use relative modules.
• Updated the Esmerald ASGI template (thanks to @sinisaos for this).
• When using the remove method to delete a row from the database (e.g. await some_band.remove()), then some_band._exists_in_db is now set to False. Thanks to @sinisaos for this fix.