PIN verification, notifications, multiple notif providers

Discord, Email & Telegram can be enabled, although email is always
enabled right now (will fix). Also apparently markdown hyperlinks don't
work in Discord, eventually will implement something to convert them to
embeds.

email.go

@@ -230,7 +230,7 @@ func (emailer *Emailer) construct(app *appContext, section, keyFragment string,
 	var keys []string
 	plaintext := app.config.Section("email").Key("plaintext").MustBool(false)
 	if plaintext {
-		if telegramEnabled {
+		if telegramEnabled || discordEnabled {
 			keys = []string{"text"}
 			text, markdown = "", ""
 		} else {
@@ -238,7 +238,7 @@ func (emailer *Emailer) construct(app *appContext, section, keyFragment string,
 			text = ""
 		}
 	} else {
-		if telegramEnabled {
+		if telegramEnabled || discordEnabled {
 			keys = []string{"html", "text", "markdown"}
 		} else {
 			keys = []string{"html", "text"}
@@ -807,8 +807,21 @@ func (app *appContext) sendByID(email *Message, ID ...string) error {
 		var err error
 		if tgChat, ok := app.storage.telegram[id]; ok && tgChat.Contact && telegramEnabled {
 			err = app.telegram.Send(email, tgChat.ChatID)
-		} else if address, ok := app.storage.emails[id]; ok {
+			if err != nil {
+				return err
+			}
+		}
+		if dcChat, ok := app.storage.discord[id]; ok && dcChat.Contact && discordEnabled {
+			err = app.discord.Send(email, dcChat.ChannelID)
+			if err != nil {
+				return err
+			}
+		}
+		if address, ok := app.storage.emails[id]; ok {
 			err = app.email.send(email, address.(string))
+			if err != nil {
+				return err
+			}
 		}
 		if err != nil {
 			return err
@@ -818,6 +831,9 @@ func (app *appContext) sendByID(email *Message, ID ...string) error {
 }
 
 func (app *appContext) getAddressOrName(jfID string) string {
+	if dcChat, ok := app.storage.discord[jfID]; ok && dcChat.Contact && discordEnabled {
+		return dcChat.Username + "#" + dcChat.Discriminator
+	}
 	if tgChat, ok := app.storage.telegram[jfID]; ok && tgChat.Contact && telegramEnabled {
 		return "@" + tgChat.Username
 	}