Enhancements

Fix broken SSID group exported to Quantumult X configurations. (#167)
Fix compatibility with some V2Ray-Core configurations.
Add support for using CORS proxy in downloading.
Optimize codes.

base/pref.ini

@@ -54,6 +54,8 @@ sssub_rule_base=base/all_base.tpl
 
 ;Proxy used to download configs, rulesets or subscriptions, set to NONE or empty to disable it, set to SYSTEM to use system proxy.
 ;Accept cURL-supported proxies (http:// https:// socks4a:// socks5://)
+;Additional support for CORS proxy ( https://github.com/Rob--W/cors-anywhere https://github.com/Zibri/cloudflare-cors-anywhere etc.), prefix the address with "cors:" to recognize the address as CORS proxy.
+;Example:  http://127.0.0.1:80  socks5://example.com:1080  cors:https://cors-anywhere.herokuapp.com/
 proxy_config=SYSTEM
 proxy_ruleset=SYSTEM
 proxy_subscription=NONE