CppTools: Move RawProjectPart to ProjectExplorer

Doesn't have any dependencies into CppTools anymore, therefore moving it
reduces the dependencies of the project managers to CppTools as well.

Change-Id: Ibe728abe59eb88a8877943dca1f48a85163e27ac
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/fileapireader.cpp

@@ -206,11 +206,11 @@ std::unique_ptr<CMakeProjectNode> FileApiReader::generateProjectTree(
     return std::move(m_rootProjectNode);
 }
 
-CppTools::RawProjectParts FileApiReader::createRawProjectParts(QString &errorMessage)
+RawProjectParts FileApiReader::createRawProjectParts(QString &errorMessage)
 {
     Q_UNUSED(errorMessage)
 
-    CppTools::RawProjectParts result = std::move(m_projectParts);
+    RawProjectParts result = std::move(m_projectParts);
     m_projectParts.clear();
     return result;
 }