#1141 Fixes to TOTP implementation

- Revert back to SHA1 as HMAC hash function so that it works with Google authenticator
- Add message to user to tell him to run /2fa confirm to add a TOTP code

src/main/resources/plugin.yml

@@ -23,7 +23,7 @@ commands:
     usage: /email show|add|change|recover|code|setpassword
   login:
     description: Login command
-    usage: /login <password> [2facode]
+    usage: /login <password>
     aliases:
     - l
     - log
@@ -48,7 +48,7 @@ commands:
     - cp
   totp:
     description: TOTP commands
-    usage: /totp add|confirm|remove
+    usage: /totp code|add|confirm|remove
     aliases:
     - 2fa
   captcha: