ToolChain: Get rid of type() in favor of typeId()

Change-Id: I8fc68c266acb55a7c3e014697a7b526784914f7a
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>

src/plugins/cpptools/cppprojects.h

@@ -130,7 +130,7 @@ public: // fields
     QString projectConfigFile; // currently only used by the Generic Project Manager
     QByteArray projectDefines;
     QByteArray toolchainDefines;
-    QString toolchainType;
+    Core::Id toolchainType;
     QList<HeaderPath> headerPaths;
     QStringList precompiledHeaders;
     LanguageVersion languageVersion;