PLT-1378 Initial version of emoji reactions (#4520)

* Refactored emoji.json to support multiple aliases and emoji categories

* Added custom category to emoji.jsx and stabilized all fields

* Removed conflicting aliases for :mattermost: and :ca:

* fixup after store changes

* Added emoji reactions

* Removed reactions for an emoji when that emoji is deleted

* Fixed incorrect test case

* Renamed ReactionList to ReactionListView

* Fixed 👍 and 👎 not showing up as possible reactions

* Removed text emoticons from emoji reaction autocomplete

* Changed emoji reactions to be sorted by the order that they were first created

* Set a maximum number of listeners for the ReactionStore

* Removed unused code from Textbox component

* Fixed reaction permissions

* Changed error code when trying to modify reactions for another user

* Fixed merge conflicts

* Properly applied theme colours to reactions

* Fixed ESLint and gofmt errors

* Fixed ReactionListContainer to properly update when its post prop changes

* Removed unnecessary escape characters from reaction regexes

* Shared reaction message pattern between CreatePost and CreateComment

* Removed an unnecessary select query when saving a reaction

* Changed reactions route to be under /reactions

* Fixed copyright dates on newly added files

* Removed debug code that prevented all unit tests from being ran

* Cleaned up unnecessary code for reactions

* Renamed ReactionStore.List to ReactionStore.GetForPost

webapp/utils/constants.jsx

@@ -122,6 +122,10 @@ export const ActionTypes = keyMirror({
     UPDATED_CUSTOM_EMOJI: null,
     REMOVED_CUSTOM_EMOJI: null,
 
+    RECEIVED_REACTIONS: null,
+    ADDED_REACTION: null,
+    REMOVED_REACTION: null,
+
     RECEIVED_MSG: null,
 
     RECEIVED_MY_TEAM: null,
@@ -206,7 +210,9 @@ export const SocketEvents = {
     EPHEMERAL_MESSAGE: 'ephemeral_message',
     STATUS_CHANGED: 'status_change',
     HELLO: 'hello',
-    WEBRTC: 'webrtc'
+    WEBRTC: 'webrtc',
+    REACTION_ADDED: 'reaction_added',
+    REACTION_REMOVED: 'reaction_removed'
 };
 
 export const TutorialSteps = {