Переименование GUID на UUID

src/entities/User.cpp

@@ -7,14 +7,14 @@ using namespace std;
 
 namespace uad
 {
-const string& User::GetGUID() const noexcept
+const string& User::GetUUID() const noexcept
 {
-  return guid_;
+  return uuid_;
 }
 
-void User::SetGUID(const string& new_guid)
+void User::SetUUID(const string& new_uuid)
 {
-  guid_ = new_guid;
+  uuid_ = new_uuid;
 }
 
 const string& User::GetLogin() const noexcept