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* golint has been replaced by revive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/messages.go

@@ -6,6 +6,7 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
+// SetMessagesVisibility will set the visibility of multiple messages by ID.
 func SetMessagesVisibility(messageIDs []string, visibility bool) error {
 	// Save new message visibility
 	if err := saveMessageVisibility(messageIDs, visibility); err != nil {
@@ -17,7 +18,7 @@ func SetMessagesVisibility(messageIDs []string, visibility bool) error {
 	// Note: Our client expects a single message at a time, so we can't just
 	// send an array of messages in a single update.
 	for _, id := range messageIDs {
-		message, err := getMessageById(id)
+		message, err := getMessageByID(id)
 		if err != nil {
 			log.Errorln(err)
 			continue