Fix: Drawer close animation. Drawer and notify open focus

[oliverfoster]

Additional fixes to pr #601

fixes #619
fixes #620

Fix

• Re-added the focusFirst calls removed in Fix: CSS to animate popups, dialog for accessibility (fixes #600) #601 to force the focus management of notify and drawer open, for issue Drawer / Notify - Links in <dialog> #620
• Changed all escape key keyup handlers to keydown in order to better trap the even with screen readers
• Changed from click to mousedown for shadow click detection
• Changed the order of drawer close animation relative to the dialog element close function call, to fix Drawer closes prematurely when activating controls inside it by keyboard #619
• Better support for deprecated drawer:closeDrawer event used by pagelevelprogress to ensure that the correct element is focused after pagelevel progress item click

[cahirodoherty-learningpool]

👀

[kirsty-hames]

Works as expected thanks 👍 Tested FF, Chrome, Safari and iPhone. Screen reader tested with voiceOver on Mac Safari.

I don't have access to JAWS to test issue #620 but can confirm #619 fixed.