* Add customizable user roles

* Various fixes and improvements

* Add migration for old settings and fix tootctl role management

* spelling: account

Signed-off-by: Josh Soref <jsoref@users.noreply.github.com>

* spelling: affiliated

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* spelling: appearance

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* spelling: autosuggest

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* spelling: cacheable

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* spelling: component

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* spelling: conversations

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* spelling: domain.example

Clarify what's distinct and use RFC friendly domain space.

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* spelling: environment

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* spelling: exceeds

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* spelling: functional

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* spelling: inefficiency

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* spelling: not

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* spelling: notifications

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* spelling: occurring

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* spelling: position

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* spelling: progress

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* spelling: promotable

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* spelling: reblogging

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* spelling: repetitive

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* spelling: resolve

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* spelling: saturated

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* spelling: similar

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* spelling: strategies

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* spelling: success

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* spelling: targeting

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* spelling: thumbnails

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* spelling: unauthorized

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* spelling: unsensitizes

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* spelling: validations

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* spelling: various

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Co-authored-by: Josh Soref <jsoref@users.noreply.github.com>

* Change account and user fabricators to simplify and improve tests

- `Fabricate(:account)` implicitly fabricates an associated `user` if
  no `domain` attribute is given (an account with `domain: nil` is
  considered a local account, but no user record was created), unless
  `user: nil` is passed
- `Fabricate(:account, user: Fabricate(:user))` should still be possible
  but is discouraged.

* Fix and refactor tests

- avoid passing unneeded attributes to `Fabricate(:user)` or
  `Fabricate(:account)`
- avoid embedding `Fabricate(:user)` into a `Fabricate(:account)` or the other
  way around
- prefer `Fabricate(:user, account_attributes: …)` to
  `Fabricate(:user, account: Fabricate(:account, …)`
- also, some tests were using remote accounts with local user records, which is
  not representative of production code.