LibLine: Handle initialize() internally

This patch makes initialize() transparent to the users, but exposes it
publicly, as the users might need a copy of the default termios (i.e.
Shell)

Applications/Debugger/main.cpp

@@ -186,8 +186,6 @@ int main(int argc, char** argv)
     if (argc == 1)
         return usage();
 
-    editor.initialize();
-
     StringBuilder command;
     command.append(argv[1]);
     for (int i = 2; i < argc; ++i) {