[Qt] QtLauncher refactoring, separating the webview and
adding a QGraphicsWebView based version.

* QtLauncher/QtLauncher.pro:
* QtLauncher/main.cpp:
(MainWindow::MainWindow):
* QtLauncher/webpage.h:
* QtLauncher/webview.cpp: Added.
(createContextMenu):
(WebViewGraphicsBased::mousePressEvent):
(WebViewTraditional::mousePressEvent):
(WebViewGraphicsBased::contextMenuEvent):
(WebViewTraditional::contextMenuEvent):
* QtLauncher/webview.h: Added.
(WebViewGraphicsBased::WebViewGraphicsBased):
(WebViewTraditional::WebViewTraditional):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@53937 268f45cc-cd09-0410-ab3c-d52691b4dbfc