refactor: pass structs as pointers except for background things

src/main.c

@@ -13,13 +13,13 @@
 int main(int argc, char **argv) {
   Parameters params;
 
-  params = args_parse(argc, argv);
+  args_parse(&params, argc, argv);
 
   puts(PACKAGE " " VERSION);
 
   set_seed((unsigned long)time(NULL));
 
-  forge_run(params);
+  forge_run(&params);
 
   return EXIT_SUCCESS;
 }