wry@0.12.2

Fixed a Linux multi-window issue where the internal url loader didn’t unlock when flushed while empty
- 5377821 Fix async multiwindow deadlock (#382) on 2021-08-16
The custom protocol now returns a Request and expects a Response.
This allows us to get the complete request from the Webview. (Method, GET, POST, PUT etc..) Read the complete header.
And allow us to be more flexible in the future without bringing breaking changes.
d202573 refactor: Custom protocol request/response (#387) on 2021-08-22
On Linux, automation callbacks now use the first created webview as the return value
- f9d7049 Use the first created webview for webkit2gtk automation callbacks (#383) on 2021-08-16