PLT-3077 Add group messaging (#5489)

* Implement server changes for group messaging

* Majority of client-side implementation

* Some server updates

* Added new React multiselect component

* Fix style issues

* Add custom renderer for options

* Fix model test

* Update ENTER functionality for multiselect control

* Remove buttons from multiselect UI control

* Updating group messaging UI (#5524)

* Move filter controls up a component level

* Scroll with arrow keys

* Updating mobile layout for multiselect (#5534)

* Fix race condition when backspacing quickly

* Hidden or new GMs show up for regular messages

* Add overriding of number remaining text

* Add UI filtering for team if config setting set

* Add icon to channel switcher and class prop to status icon

* Minor updates per feedback

* Improving group messaging UI (#5563)

* UX changes per feedback

* Update email for group messages

* UI fixes for group messaging (#5587)

* Fix missing localization string

* Add maximum users message when adding members to GM

* Fix input clearing on Android

* Updating group messaging UI (#5603)

* Updating UI for group messaging (#5604)

store/sql_channel_store.go

@@ -211,7 +211,7 @@ func (s SqlChannelStore) saveChannelT(transaction *gorp.Transaction, channel *mo
 		return result
 	}
 
-	if channel.Type != model.CHANNEL_DIRECT {
+	if channel.Type != model.CHANNEL_DIRECT && channel.Type != model.CHANNEL_GROUP {
 		if count, err := transaction.SelectInt("SELECT COUNT(0) FROM Channels WHERE TeamId = :TeamId AND DeleteAt = 0 AND (Type = 'O' OR Type = 'P')", map[string]interface{}{"TeamId": channel.TeamId}); err != nil {
 			result.Err = model.NewLocAppError("SqlChannelStore.Save", "store.sql_channel.save_channel.current_count.app_error", nil, "teamId="+channel.TeamId+", "+err.Error())
 			return result