add shadow-muting chat hiding feature (automatic flagging of public posts from shadow-muted players) - fixes 10851 (#11239)

* move existing tests for chatRevoked users to 'mute user' describe block

* give consistent names to chatRevoked tests and use const not let

* improve methods for restoring chat permissions to test users

* add tests for shadow-muting and define constants for flag-related numbers

* update user profile URLs and reverse private/public 'if' statements

* implement shadow muting in the API and schemas

* add interface for mods to turn shadow muting on/off for a user

- checkbox in the Hall
- icon in the user's profile

* mark chat posts as being shadow muted (marking is visible to mods only)

* convert Admin Tools in profile from icons to text; make crown icon a toggle

* move logic for displaying flag count to a computed property

* prevent chat notifications for shadow-muted posts

website/common/script/index.js

@@ -29,6 +29,9 @@ import {
   SUPPORTED_SOCIAL_NETWORKS,
   GUILDS_PER_PAGE,
   PARTY_LIMIT_MEMBERS,
+  CHAT_FLAG_LIMIT_FOR_HIDING,
+  CHAT_FLAG_FROM_MOD,
+  CHAT_FLAG_FROM_SHADOW_MUTE,
 } from './constants';
 
 api.constants = {
@@ -40,6 +43,9 @@ api.constants = {
   SUPPORTED_SOCIAL_NETWORKS,
   GUILDS_PER_PAGE,
   PARTY_LIMIT_MEMBERS,
+  CHAT_FLAG_LIMIT_FOR_HIDING,
+  CHAT_FLAG_FROM_MOD,
+  CHAT_FLAG_FROM_SHADOW_MUTE,
 };
 // TODO Move these under api.constants
 api.maxLevel = MAX_LEVEL;