almost complete telegram user verification

When signing up, the user is given a pin code which they send to a
telegram bot. This provides user verification, but more importantly
allows the bot to message the user, as the Telegram API requires the
user to interact with the bot before it can do the opposite.

The bot should recognize the correct language, but a /lang command is
also provided to change it.

The verification process is pretty much functional but ui is still
broken, and it isn't properly integrated yet.

main.go

@@ -93,6 +93,7 @@ type appContext struct {
 	storage          Storage
 	validator        Validator
 	email            *Emailer
+	telegram         *TelegramDaemon
 	info, debug, err logger.Logger
 	host             string
 	port             int
@@ -257,6 +258,7 @@ func start(asDaemon, firstCall bool) {
 	app.storage.lang.FormPath = "form"
 	app.storage.lang.AdminPath = "admin"
 	app.storage.lang.EmailPath = "email"
+	app.storage.lang.TelegramPath = "telegram"
 	app.storage.lang.PasswordResetPath = "pwreset"
 	externalLang := app.config.Section("files").Key("lang_files").MustString("")
 	var err error
@@ -325,6 +327,10 @@ func start(asDaemon, firstCall bool) {
 		if err := app.storage.loadUsers(); err != nil {
 			app.err.Printf("Failed to load Users: %v", err)
 		}
+		app.storage.telegram_path = app.config.Section("files").Key("telegram_users").String()
+		if err := app.storage.loadTelegramUsers(); err != nil {
+			app.err.Printf("Failed to load Telegram users: %v", err)
+		}
 
 		app.storage.profiles_path = app.config.Section("files").Key("user_profiles").String()
 		app.storage.loadProfiles()
@@ -541,6 +547,16 @@ func start(asDaemon, firstCall bool) {
 		if app.config.Section("updates").Key("enabled").MustBool(false) {
 			go app.checkForUpdates()
 		}
+
+		if app.config.Section("telegram").Key("enabled").MustBool(false) {
+			app.telegram, err = newTelegramDaemon(app)
+			if err != nil {
+				app.err.Printf("Failed to authenticate with Telegram: %v", err)
+			} else {
+				go app.telegram.run()
+				defer app.telegram.Shutdown()
+			}
+		}
 	} else {
 		debugMode = false
 		address = "0.0.0.0:8056"