[memdump] Make it work on fields of type (array basic) (#620)

* use `std::function` for this because that's what you're meant to do

* [memdump] Analyze fields of type `(array basic)`

* fix test

* Massively simplify things.

game/runtime.cpp

@@ -320,7 +320,7 @@ u32 exec_runtime(int argc, char** argv) {
   // TODO also sync this up with how the game actually renders things (this is just a placeholder)
   if (enable_display) {
     Gfx::Init();
-    Gfx::Loop([&tm] { return !tm.all_threads_exiting(); });
+    Gfx::Loop([&tm]() { return !tm.all_threads_exiting(); });
     Gfx::Exit();
   }