* The include guards are inconsistent with the file names now

* More importantly, other projects like QtSensors, QtLocation, QtSerialPort and
so forth are using qfooglobal.h.

* Another thing is that qfoo.{h,cpp} are preferred more than less, as in:
qmath.h, qalgorithm.h, qplugin.h, qssl.h, qnumeric.h, qconfig.h, and so forth.

Change-Id: I4b7bca741a20578e18c8a5f7612076ab729543f8
Reviewed-by: Ivan Vizir <define-true-false@yandex.com>
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>