[DF-771] Add URLChanged() delegate to UIWebView controls on MacOS and iOS. Add test delegate to WebView in UnitTests project
[DF-771] Add URLChanged() delegate to UIWebView controls on Win32
Merge remote-tracking branch 'dava/development' into DF-771-WebView_upgrade
Merge branch 'DF-771-WebView_upgrade' of https://github.com/adebt/dava.framework into merge-uiwebview