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* golint has been replaced by revive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/webhooks/webhooks.go

@@ -14,11 +14,13 @@ import (
 	"github.com/owncast/owncast/models"
 )
 
+// WebhookEvent represents an event sent as a webhook.
 type WebhookEvent struct {
 	Type      models.EventType `json:"type"` // messageSent | userJoined | userNameChange
 	EventData interface{}      `json:"eventData,omitempty"`
 }
 
+// WebhookChatMessage represents a single chat message sent as a webhook payload.
 type WebhookChatMessage struct {
 	User      *user.User `json:"user,omitempty"`
 	Body      string     `json:"body,omitempty"`
@@ -28,6 +30,7 @@ type WebhookChatMessage struct {
 	Timestamp *time.Time `json:"timestamp,omitempty"`
 }
 
+// SendEventToWebhooks will send a single webhook event to all webhook destinations.
 func SendEventToWebhooks(payload WebhookEvent) {
 	webhooks := data.GetWebhooksForEvent(payload.Type)