[feature] support electron render and cordova

[pinghe]

WebTorrent supports both nodejs and browser environments. Determine whether it is nodejs by the true or false of the typeof fs.stat === function condition. This is not enough. In the electron render process, both webrtc and fs can be supported. The cordova environment can support both webrtc and cordova-plugin-file.

Organize the following list, expecting supported environment features

seed	nodejs	electron main	electron render	cordova(file plugin)	browser
condition	window === 'undefined'	window === 'undefined'	window.process && window.process.versions && window.process.versions.electron	window._cordovaNative ¦¦ window.cordova
filesystem path to file or folder	y	y	y	y	n
W3C File object	n	n	y	y	y
W3C FileList object	n	n	y	y	y
Node Buffer object	y	y	y	y	y
Node Readable stream object	y	y	y	y	y
WEBRTC	n	n	y	y	y

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[feross]

@pinghe Thanks for opening this issue and for the detailed support table. Can you share what bug you experiencing in Electron or Cordova? We use WebTorrent in Electron for https://github.com/webtorrent/webtorrent-desktop without any issues.