Add support for China's bootcdn, staticfile, 75cdn & loli cdn
Those are public CDN services commonly used in China.
75cdn(lib.baomitu.com), loli-cdn(cdnjs.loli.net) are the mirror of cdnjs(cdnjs.cloudflare.com)\
staticfile host their own lib repo which can be found here: https://github.com/staticfile/static
loli-cdn also has a reverse proxy domain: