CppTools: Move CppHoverHandler to CppTools

This is in preparation for clang code model to provide its own hover
handler.

Change-Id: Ifbdd96f427989bd5d1fbc4badb9c38108485c2f2
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/cpptools/cpptools.qbs

@@ -90,6 +90,8 @@ Project {
             "cppeditoroutline.cpp",
             "cppeditoroutline.h",
             "cppeditorwidgetinterface.h",
+            "cppelementevaluator.cpp",
+            "cppelementevaluator.h",
             "cppfileiterationorder.cpp",
             "cppfileiterationorder.h",
             "cppfilesettingspage.cpp",
@@ -101,6 +103,8 @@ Project {
             "cppfollowsymbolundercursor.h",
             "cppfunctionsfilter.cpp",
             "cppfunctionsfilter.h",
+            "cpphoverhandler.cpp",
+            "cpphoverhandler.h",
             "cppincludesfilter.cpp",
             "cppincludesfilter.h",
             "cppindexingsupport.cpp",