Convert macros from plain QByteArray to a vector of structs

The old code model expected the macros as C++ formatted text
("#define Foo 42) but newer targets like the Clang codemodel expect key
value arguments like "-DFoo=42". So instead of parsing the text again and
again we use an abstract data description.

Task-number: QTCREATORBUG-17915
Change-Id: I0179fd13c48a581e91ee79bba9d42d501c26f19f
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/cmakeprojectmanager/cmakeproject.h

@@ -30,6 +30,7 @@
 #include "treescanner.h"
 
 #include <projectexplorer/extracompiler.h>
+#include <projectexplorer/projectmacro.h>
 #include <projectexplorer/project.h>
 
 #include <utils/fileutils.h>
@@ -72,7 +73,7 @@ public:
     // code model
     QList<Utils::FileName> includeFiles;
     QStringList compilerOptions;
-    QByteArray defines;
+    ProjectExplorer::Macros macros;
     QList<Utils::FileName> files;
 
     void clear();