Statamic 6 support

[ryanmitchell]

This PR adds Statamic v6 Support.

To do:

• Move user config to add-on settings
• Update field types
• Create updater that migrates the config
• Remove existing config file
• Should API key be in config file?
• get fieldtypes building

[edalzell]

I trust you, yolo

[edalzell]

Any idea why these tests fail @ryanmitchell ?

[ryanmitchell]

@edalzell tests are passing now

Create updater that migrates the config

This is already in the ServiceProvider - migrateUserToSettings()

Remove existing config file

This is done as part of the same function

Should API key be in config file?

I nearly did this, but I left it so it could be defined in the .env which is what people expect I think.

[edalzell]

Create updater that migrates the config

This is already in the ServiceProvider - migrateUserToSettings()

Sure but why in provider and not an updater script?