don't use shared ptr on projects

Really unnecessary

app/task/project/load/load.cpp

@@ -60,7 +60,7 @@ bool ProjectLoadTask::Run()
           } else if (reader.name() == QStringLiteral("url")) {
             project_saved_url_ = reader.readElementText();
           } else if (reader.name() == QStringLiteral("project")) {
-            project_ = std::make_shared<Project>();
+            project_ = new Project();
 
             project_->set_filename(GetFilename());
 

app/task/project/load/loadbasetask.h

@@ -32,7 +32,7 @@ class ProjectLoadBaseTask : public Task
 public:
   ProjectLoadBaseTask(const QString& filename);
 
-  ProjectPtr GetLoadedProject() const
+  Project* GetLoadedProject() const
   {
     return project_;
   }
@@ -58,7 +58,7 @@ public:
   }
 
 protected:
-  ProjectPtr project_;
+  Project* project_;
 
   MainWindowLayoutInfo layout_info_;