... and adjust INCLUDEPATH accordingly.

while i'm at messing with include statements, also re-order the include
blocks according to policy and sort them within bigger blocks.

Change-Id: I7762abfd7c4ecf59432b99db2f424e4fa25733a5
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

Please, read blueprint here:
http://qt-project.org/wiki/Blueprint-for-language-specs-system



Removed feature from QbsProjectManager: it not longer splits project on
separate C and C++ parts, because Qt version used only by clang parser
(not native) and can be ignored for pure C and Objective-C without C++.

Change-Id: I1c561f7f9f915cc6cb8579d19db74e8352f54c1e
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

Change-Id: Ia11f4d7a94465de7f12cc390855e54e3256e5455
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

Change-Id: Id31ce6b40d72351cfaefa5035469b87662526853
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

Change-Id: I30815b191654cba5eedf92a9afd2ed1b48af8b87
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>