Enhancements

Fix when subscription download timeout before complete, the parser will still try to parse downloaded content.
Change default regex library to PCRE2.
Change Quantumult X "url-test" equivalent to "available".
Optimize codes.
Update build scripts.

src/misc.h

@@ -40,10 +40,10 @@ bool is_str_utf8(std::string data);
 std::string getFormData(const std::string &raw_data);
 
 void sleep(int interval);
-bool regValid(std::string &reg);
+bool regValid(std::string &target);
 bool regFind(std::string src, std::string target);
 std::string regReplace(std::string src, std::string match, std::string rep);
-bool regMatch(std::string src, std::string match);
+bool regMatch(std::string src, std::string match, bool partial = false);
 std::string speedCalc(double speed);
 std::string getMD5(std::string data);
 bool isIPv4(std::string &address);