CppTools: Turn some classes into pure value types

ProjectInfo, ProjectPart and ProjectUpdateInfo used to carry pointers
to Project and/or Toolchain, even though they were used in contexts
where these pointers were either unsafe to access or not guaranteed to
be valid anymore, which made their use difficult and error-prone.
We turn these classes into pure value types by copying in all relevant
information before the first async operation takes place.

Fixes: QTCREATORBUG-25678
Change-Id: I1914b0dbda6c7dfba6c95e5e92f2d69977755590
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/plugins/cpptools/cpptoolstestcase.h

@@ -27,6 +27,8 @@
 
 #include "cpptools_global.h"
 
+#include "projectinfo.h"
+
 #include <cplusplus/CppDocument.h>
 #include <utils/temporarydirectory.h>
 
@@ -52,7 +54,6 @@ class IAssistProposal;
 
 namespace CppTools {
 class CppModelManager;
-class ProjectInfo;
 
 namespace Tests {
 
@@ -140,7 +141,7 @@ public:
     ProjectOpenerAndCloser();
     ~ProjectOpenerAndCloser(); // Closes opened projects
 
-    ProjectInfo open(const QString &projectFile, bool configureAsExampleProject = false,
+    CppTools::ProjectInfo::Ptr open(const QString &projectFile, bool configureAsExampleProject = false,
                      ProjectExplorer::Kit *kit = nullptr);
 
 private: