automate the Chrome browser

Changes for 0.72 - 2023-11-21

• requires Perl 5.020 due to various features
• WWW::Mechanize::Chrome now emits events instead of having callbacks. This allows multiple subscribers for an event.
• ->on_popup is now an event. To port replace ->on_popup with ->on( 'popup' => sub( $mech, $tab ) { ... })
• Chrome::DevToolsProtocol::Target::on_message now emits an event. To port replace ->on_message with ->on( 'message' => sub( $mech, $m ) { ... })
• Added "app" option to make Chrome show up without address bar etc.
• More command line switches to disable Chrome update behaviour