Ability to add friends. Also, made a few helper functions.

common/method_data.go

@@ -13,3 +13,13 @@ type MethodData struct {
 	RequestData []byte
 	C           *gin.Context
 }
+
+// Err logs an error into gin.
+func (md MethodData) Err(err error) {
+	md.C.Error(err)
+}
+
+// ID retrieves the Token's owner user ID.
+func (md MethodData) ID() int {
+	return md.User.UserID
+}