Auth Strategies (#1257)

* auth strategies

* default to no auth

* rename base auth strategy

* rename base strategy cont.

* refactor auth strategy methods and LocalAuth

* activate old session options even if is falsy value

* move restartOnAuthFail to LegacyAuthStrategy option

* add link to guide item

* update example/shell

* types

.gitignore

@@ -70,7 +70,4 @@ typings/
 
 # Test sessions
 *session.json
-
-# user data
-WWebJS/
-userDataDir/
+.wwebjs_auth/