Add customizable user roles (#18641)

* Add customizable user roles

* Various fixes and improvements

* Add migration for old settings and fix tootctl role management

app/javascript/mastodon/reducers/meta.js

@@ -7,12 +7,13 @@ const initialState = ImmutableMap({
   streaming_api_base_url: null,
   access_token: null,
   layout: layoutFromWindow(),
+  permissions: '0',
 });
 
 export default function meta(state = initialState, action) {
   switch(action.type) {
   case STORE_HYDRATE:
-    return state.merge(action.state.get('meta'));
+    return state.merge(action.state.get('meta')).set('permissions', action.state.getIn(['role', 'permissions']));
   case APP_LAYOUT_CHANGE:
     return state.set('layout', action.layout);
   default: