Add progress indicator when loading a file in case user reads from a server and not a local disk

src/frontend/main.cpp

@@ -1,7 +1,7 @@
 #include <KaizenGui.hpp>
 #include <cflags.hpp>
 
-int main(int argc, char **argv) {
+int main(const int argc, char **argv) {
   KaizenGui kaizenGui; 
   cflags::cflags flags;
   flags.add_string_callback('\0', "rom", [&kaizenGui](const std::string& v) { kaizenGui.LoadROM(v); }, "Rom to launch from command-line");