Investigate making qquick::ContentsView a QQuickItem

[Chris Coulson]

Currently OxideQQuickWebView proxies a bunch of calls through to qquick::ContentsView. I've been thinking about devtools recently, and I want to make the webview inspectable (ie, make it support displaying Chromium's docked devtools UI and have it be invokable from the context menu). To make the devtools panel undockable, there will be a new client of qquick::ContentsView which will essentially be a window with a WebContents embedder in it. It would be nice to not have to duplicate a bunch of code to just proxy calls through to ContentsView.