qbs project: Add properties for pulling in additional resources.

We need this to build plugins located outside the source tree.

Change-Id: Ie587b5e838bf0ce67b19d3222bbc40b53b888e69
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
CppEditor: implement ExtractLiteralAsParameter quickfix

Task-number: QTCREATORBUG-9617

Change-Id: I6c6313746b837775bab665bb7019a2adf0b0f286
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>