Side-wide multisite support

Hi,

I would suggest to provide support to multisite.

Configuration only on Super Admin. No configuration in networke sites.

When Super Admin set CDN Root URL as “example-cdn.com”, all network sites will use that CDN URL automatically.

Currently, CDN for multisite is only available in WP Super Cache & W3 Total Cache.
But those plugin is static HTML caching plugin, which not useful for all website.

https://ww.wp.xz.cn/plugins/wp-cdn-rewrite/