Add virtual converter output interface

typefactory/main.cpp

@@ -2,7 +2,7 @@
 #include <iostream>
 #include <string>
 
-#include "converter.h"
+#include "convertlatex.h"
 
 struct CliArgs {
   std::string input;
@@ -53,7 +53,7 @@ int main (int argc, char **argv) {
   if (!parse_args (argc, argv, args))
     return 1;
 
-  Converter converter (args.input);
+  ConvertLatex converter (args.input);
   if (!converter.save (args.output))
     return converter.error_code();