Outbound live stream notifications (#1663)

* First pass at browser, discord, twilio notifications

* Commit updated Javascript packages

* Remove twilio notification support

* Email notifications/smtp support

* Fix Firefox notification support, remove chrome checks

* WIP more email work

* Add support for twitter notifications

* Add stream title to discord and twitter notifications

* Update notification registration modal

* Fix hide/show email section

* Commit updated API documentation

* Commit updated Javascript packages

* Fix post-rebase missing var

* Remove unused var

* Handle unsubscribe errors for browser push

* Standardize email config prop names

* Allow overriding go live email template

* Some notifications cleanup

* Commit updated Javascript packages

* Remove email/smtp/mailjet support

* Remove more references to email notifications

Co-authored-by: Owncast <owncast@owncast.online>

utils/utils.go

@@ -13,6 +13,7 @@ import (
 	"path/filepath"
 	"regexp"
 	"strings"
+	"time"
 
 	"github.com/mssola/user_agent"
 	log "github.com/sirupsen/logrus"
@@ -366,3 +367,12 @@ func GetHashtagsFromText(text string) []string {
 	re := regexp.MustCompile(`#[a-zA-Z0-9_]+`)
 	return re.FindAllString(text, -1)
 }
+
+// ShuffleStringSlice will shuffle a slice of strings.
+func ShuffleStringSlice(s []string) []string {
+	rand.Seed(time.Now().UnixNano())
+	rand.Shuffle(len(s), func(i, j int) {
+		s[i], s[j] = s[j], s[i]
+	})
+	return s
+}