Mobile client OAuth2 support

pubspec.lock

@@ -64,8 +64,15 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.15.0"
-  crypto:
+  convert:
     dependency: transitive
+    description:
+      name: convert
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.0"
+  crypto:
+    dependency: "direct main"
     description:
       name: crypto
       url: "https://pub.dartlang.org"
@@ -78,6 +85,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.3"
+  dart_jsonwebtoken:
+    dependency: "direct main"
+    description:
+      name: dart_jsonwebtoken
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.2.0"
   device_info:
     dependency: "direct main"
     description:
@@ -359,6 +373,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.0"
+  pointycastle:
+    dependency: transitive
+    description:
+      name: pointycastle
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.1"
   qr_code_scanner:
     dependency: "direct main"
     description: