The ifdefs should later be removed along with the feature
implementations.

Change-Id: If73f4c4c02c00e90d6cf54c6a08bb37f43fa95bc
Reviewed-by: Andras Becsi <andras.becsi@digia.com>

This also ajust the name to be consistent with other Qt examples.
- Move nano browser one directory level down,
  also renaming them to match their target name
- Remove the dashes from the target names
- Rename the qtquick example directory to quick, matching the style in lib

Change-Id: I4a5e31be0b919ae596eadbf731be52372ae61151
Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>

This is the first step to making proper Qt Modules out of QtWebEngine.
The Widgets integration becomes a proper C++ Qt Module while we make
the QtQuick side a QML plugin for now (could probably be promoted if
the need arises).

Code-wise, this means the introduction of a WebContentsAdapterClient
interface that is subclassed by the private implementation of our API
classes for delegation of things that are UI specific. Functionality
from WebContents and the like is exposed via the WebContentsAdapter.

Change-Id: I4ca3395b9fe8502a24e36002cfd5af44067bb6e8
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

Cleaner than deciding on startup with an env variable