Add customizable user roles (#18641)

* Add customizable user roles

* Various fixes and improvements

* Add migration for old settings and fix tootctl role management

db/migrate/20220611210335_create_user_roles.rb

@@ -0,0 +1,13 @@
+class CreateUserRoles < ActiveRecord::Migration[6.1]
+  def change
+    create_table :user_roles do |t|
+      t.string :name, null: false, default: ''
+      t.string :color, null: false, default: ''
+      t.integer :position, null: false, default: 0
+      t.bigint :permissions, null: false, default: 0
+      t.boolean :highlighted, null: false, default: false
+
+      t.timestamps
+    end
+  end
+end