Add support for true fullscreen (#2016)

* Support for true fullscreen

* clang

* Re-add mistakenly deleted line

* Size

I adjusted the size of the entire screen.
trophies font size and added a margin so it wouldn't be so spaced out.

---------

Co-authored-by: DanielSvoboda <daniel.svoboda@hotmail.com>

src/main.cpp

@@ -86,7 +86,7 @@ int main(int argc, char* argv[]) {
                  exit(1);
              }
              // Set fullscreen mode without saving it to config file
-             Config::setFullscreenMode(is_fullscreen);
+             Config::setIsFullscreen(is_fullscreen);
          }},
         {"--fullscreen", [&](int& i) { arg_map["-f"](i); }},
         {"--add-game-folder",