Bug 78820

As discussed in the API review session in Szeged, there are a few straight-forward changes to the properties and signals of QQuickWebView that we should do before the release: * Remove canReload * Remove parameter from titleChanged, urlChanged, iconChanged, loadProgressChanged * loadFailed: change signature to loadFailed(failedUrl, description, errorDomain, errorCode) * linkHovered should be linkHovered(hoveredUrl, hoveredTitle) * Get rid of loadStarted and loadSucceeded, add loadingChanged instead * Remove navigationStateChanged, add canGoBackChanged and canGoForwardChanged For future reference let me try to recall the reasons we came up with in the discussion: * canReload is redundant in the face of "loading", the implementation of the one is the reverse of the other. * The parameters to the *Changed signals are redundant and usually not present in other QML modules. * The parameters in loadFailed should be ordered by importance and we should use failedUrl instead of url to avoid shadowing the WebView's url property * loadStarted and loadSuceeded are redundant in the face of a notification signal of the loading property: loadingChanged. If the loading property is true in the slot connected to the loadingChanged signal, then the load started, if the value is false the load finished. * The url and title properties in linkHovered should be renamed to avoid shadowing