Implemented OnStatusMessage and event for WPF and WinForms.
Add StatusMessage examples for WPF/WinForms.
Merge pull request #443 from TheCloudlessSky/status-message-v3

Implemented OnStatusMessage and event for WPF and WinForms for CefSharp3
Merge remote-tracking branch 'remotes/upstream/master' into JsBinding_WIP