CppTools: Move QtVersion and BuildTargetType

QtVersion to utils/cpplanguage_details.h which already contains similar
flags.

BuildTargetType to ProjectExplorer, next to BuildTargetInfo (but not in the
same header to not pull that in everywhere).

Removes dependency on ProjectPart from RawProjectPart.

Change-Id: I5791065e4266f20c2657ee4b1b594df04b238a1c
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cmakeprojectmanager/fileapidataextractor.cpp

@@ -317,8 +317,8 @@ CppTools::RawProjectParts generateRawProjectParts(const PreprocessedData &input,
             }));
 
             const bool isExecutable = t.type == "EXECUTABLE";
-            rpp.setBuildTargetType(isExecutable ? CppTools::ProjectPart::Executable
-                                                : CppTools::ProjectPart::Library);
+            rpp.setBuildTargetType(isExecutable ? ProjectExplorer::BuildTargetType::Executable
+                                                : ProjectExplorer::BuildTargetType::Library);
             rpps.append(rpp);
         }
     }