Replaced the code to substitute host address part in URL

with libcurl library calls. This solution should be more robust
than a homebrew URL parser solution.

src/slic3r/Utils/TCPConsole.hpp

@@ -13,6 +13,8 @@ namespace Utils {
 
 using boost::asio::ip::tcp;
 
+// Generic command / response TCP telnet like console class.
+// Used by the MKS host to send G-code commands to test connection ("M105") and to start printing ("M23 filename", "M24").
 class TCPConsole
 {
 public: