Expanded linting + fix warnings (#1396)

* Expand the linters and types of warnings to improve consistency and safety

* Fail lint workflow if there are errors

* golint has been replaced by revive

* Hand-pick some of the default exclude list

* Ignore error when trying to delete preview gif

* Ignore linter warning opening playlist path

* Rename user field Id -> ID

* A bunch of renames to address linter warnings

* Rename ChatClient -> Client per linter suggestion best practice

* Rename ChatServer -> Server per linter suggestion best practice

* More linter warning fixes

* Add missing comments to all exported functions and properties

core/chat/events/systemMessageEvent.go

@@ -8,10 +8,10 @@ type SystemMessageEvent struct {
 	MessageEvent
 }
 
-// SystemMessageEvent will return the object to send to all chat users.
+// GetBroadcastPayload will return the object to send to all chat users.
 func (e *SystemMessageEvent) GetBroadcastPayload() EventPayload {
 	return EventPayload{
-		"id":        e.Id,
+		"id":        e.ID,
 		"timestamp": e.Timestamp,
 		"body":      e.Body,
 		"type":      SystemMessageSent,
@@ -21,6 +21,7 @@ func (e *SystemMessageEvent) GetBroadcastPayload() EventPayload {
 	}
 }
 
+// GetMessageType will return the event type for this message.
 func (e *SystemMessageEvent) GetMessageType() EventType {
 	return SystemMessageSent
 }