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/cpptools/projectpart.h

@@ -31,6 +31,7 @@
 #include "projectpartheaderpath.h"
 
 #include <projectexplorer/projectexplorer_global.h>
+#include <projectexplorer/projectmacro.h>
 
 #include <coreplugin/id.h>
 
@@ -118,7 +119,7 @@ public:
     QStringList precompiledHeaders;
     ProjectPartHeaderPaths headerPaths;
 
-    QByteArray projectDefines;
+    ProjectExplorer::Macros projectMacros;
 
     LanguageVersion languageVersion = LatestCxxVersion;
     LanguageExtensions languageExtensions = NoExtensions;
@@ -130,7 +131,7 @@ public:
 
     Core::Id toolchainType;
     bool isMsvc2015Toolchain = false;
-    QByteArray toolchainDefines;
+    ProjectExplorer::Macros toolChainMacros;
     ToolChainWordWidth toolChainWordWidth = WordWidth32Bit;
     QString toolChainTargetTriple;
 };