Enhancements

Fix support for parsing some Surge configurations.
Fix adding extra blank line to section end when exporting some configurations.
Fix adding real internal link as MANAGED-CONFIG URL when using profile.
Fix not filtering load-balance group in Surfboard configurations. (Issue [#128](https://github.com/tindy2013/subconverter/issues/128)).
Fix rule type filter not working properly.
Add support for using template in external configurations.
Add relay group support for Clash configurations.
Optimize codes.

src/speedtestutil.cpp

@@ -1211,7 +1211,8 @@ bool explodeSurge(std::string surge, const std::string &custom_port, int local_p
     ini.SetIsolatedItemsSection("Proxy");
     ini.IncludeSection("Proxy");
     ini.AddDirectSaveSection("Proxy");
-    surge = regReplace(surge, "^#!.*$\\r?\\n", "");
+    if(surge.find("[Proxy]") != surge.npos)
+        surge = regReplace(surge, "^[\\S\\s]*?\\[", "[");
     ini.Parse(surge);
 
     if(!ini.SectionExist("Proxy"))