GRN2-176: Create a role editor that allows admins to specify what permissions each role has (#709)

* Add roles editor

* Add colour selection ability to roles

* Add ability to assign roles to users in the UI

* Remove rolify and replace it with our own custom roles implemenation

* - Fix all existing roles functionality
- Fix super admins

* Fix bugs with new customers not have default roles

* Add can't create room setting

* Code improvements

* Fix migration

* Add tests for new methods

* Translate reserved role names

* Pull roles from saml/ldap

* Fix rspec

* Fix scrutinizer issues

* Fix email promoted/demoted tests

* Apply comments

* Redirect directly to the main room

* Add comments

app/models/role.rb

@@ -19,13 +19,25 @@
 class Role < ApplicationRecord
   has_and_belongs_to_many :users, join_table: :users_roles
 
-  belongs_to :resource,
-    polymorphic: true,
-    optional: true
+  default_scope { order(:priority) }
+  scope :by_priority, -> { order(:priority) }
+  scope :editable_roles, ->(provider) { where(provider: provider).where.not(name: %w[super_admin denied pending]) }
 
-  validates :resource_type,
-    inclusion: { in: Rolify.resource_types },
-    allow_nil: true
+  RESERVED_ROLE_NAMES = %w[super_admin admin pending denied user]
 
-  scopify
+  def self.duplicate_name(name, provider)
+    RESERVED_ROLE_NAMES.include?(name) || Role.exists?(name: name, provider: provider)
+  end
+
+  def self.create_default_roles(provider)
+    Role.create(name: "user", provider: provider, priority: 1, can_create_rooms: true, colour: "#868e96")
+    Role.create(name: "admin", provider: provider, priority: 0, can_create_rooms: true, send_promoted_email: true,
+      send_demoted_email: true, can_edit_site_settings: true,
+      can_edit_roles: true, can_manage_users: true, colour: "#f1c40f")
+    Role.create(name: "pending", provider: provider, priority: -1, colour: "#17a2b8")
+    Role.create(name: "denied", provider: provider, priority: -1, colour: "#343a40")
+    Role.create(name: "super_admin", provider: provider, priority: -2, can_create_rooms: true,
+      send_promoted_email: true, send_demoted_email: true, can_edit_site_settings: true,
+      can_edit_roles: true, can_manage_users: true, colour: "#cd201f")
+  end
 end