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

store/sql_store.go

@@ -84,6 +84,7 @@ type SqlStore struct {
 	emoji         EmojiStore
 	status        StatusStore
 	fileInfo      FileInfoStore
+	reaction      ReactionStore
 	SchemaVersion string
 	rrCounter     int64
 }
@@ -134,6 +135,7 @@ func NewSqlStore() Store {
 	sqlStore.emoji = NewSqlEmojiStore(sqlStore)
 	sqlStore.status = NewSqlStatusStore(sqlStore)
 	sqlStore.fileInfo = NewSqlFileInfoStore(sqlStore)
+	sqlStore.reaction = NewSqlReactionStore(sqlStore)
 
 	err := sqlStore.master.CreateTablesIfNotExists()
 	if err != nil {
@@ -161,6 +163,7 @@ func NewSqlStore() Store {
 	sqlStore.emoji.(*SqlEmojiStore).CreateIndexesIfNotExists()
 	sqlStore.status.(*SqlStatusStore).CreateIndexesIfNotExists()
 	sqlStore.fileInfo.(*SqlFileInfoStore).CreateIndexesIfNotExists()
+	sqlStore.reaction.(*SqlReactionStore).CreateIndexesIfNotExists()
 
 	sqlStore.preference.(*SqlPreferenceStore).DeleteUnusedFeatures()
 
@@ -676,6 +679,10 @@ func (ss *SqlStore) FileInfo() FileInfoStore {
 	return ss.fileInfo
 }
 
+func (ss *SqlStore) Reaction() ReactionStore {
+	return ss.reaction
+}
+
 func (ss *SqlStore) DropAllTables() {
 	ss.master.TruncateTables()
 }