EBEAST: main.js: stop 'will-navigate' & 'new-window' events
EBEAST: main.js: stop 'will-navigate' & 'new-window' events

Prevent navigating to a new URL or opening a new BrowserWindow by
preventing the default action of 'will-navigate' & 'new-window' events.

Signed-off-by: Tim Janik <6ec6ff229c4e1c5bbd5933ee92e6c5832ff023bb@gnu.org>

swesterfeld/beast,swesterfeld/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,swesterfeld/beast,tim-janik/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,swesterfeld/beast,tim-janik/beast,tim-janik/beast,tim-janik/beast