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

src/util/Constants.js

@@ -7,8 +7,6 @@ exports.DefaultOptions = {
         headless: true,
         defaultViewport: null
     },
-    dataPath: './WWebJS/',
-    useDeprecatedSessionAuth: false,
     authTimeoutMs: 0,
     qrMaxRetries: 0,
     takeoverOnConflict: false,