Add new window requested event callback/event

[atlanticaccent]

Is your feature request related to a problem? Please describe.
I'd like to be able to intercept and view information about new window events (ie: popups, target=_blank links, etc) and choose whether to allow them.

Describe the solution you'd like
A way to register a handler for new window events.

Describe alternatives you've considered
Onbeforeload javascript to rewrite and/or register javascript event handlers on all potential sources of navigation - this does not cover programatically added buttons and a number of other cases.
Proxying - requires a local proxy on the entire host machine OR implementation of the proxying configuration on webviews. Either option would probably be quite cumbersome.

Would you assign yourself to implement this feature?

• Yes
• No

Additional context
I'm creating this issue as more of a formality than anything - I already have a PR for this open