Proxy List Check "Multi" Type

[frozen-cdn]

Almost all "proxy lists" are poorly maintained

Requests may fail because you try a SOCKS5 proxy with HTTP proxy requests and vice versa

Add an optional (with SLOW! warning) checkbox, or maybe just proxy type selection (instead of socks5/4/http pick "Multi (SLOW!)" for example.. for thorough proxy checking: You no longer specify a proxy type, just paste a list in and go, all 3 styles will be checked. If fail is received on SOCKS5, fallback to SOCKS4, then fallback to HTTP, then if still fail = not working

[openbullet]

Please open an issue about this and I will think about the best way to add this feature.