Collects all included files from any file of any project or
that is open in an editor. It has the same shortcut as the
files from any project filter and is also enabled by default.

Task-number: QTCREATORBUG-280
Change-Id: I7cd89ee68d2f8ec4e0ea03de0c11671f489c47dc
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>