PPU upgrades, move Memory to own dir

src/app/core/emulator.cc

@@ -53,6 +53,7 @@ void Emulator::RenderNavBar() {
   }
 
   if (ImGui::BeginMenu("Debug")) {
+    ImGui::MenuItem("PPU Register Viewer", nullptr, &show_ppu_reg_viewer_);
     MENU_ITEM("Debugger") {}
     MENU_ITEM("Memory Viewer") {}
     MENU_ITEM("Tile Viewer") {}

src/app/core/emulator.h

@@ -33,6 +33,7 @@ class Emulator : public SharedROM {
   emu::SNES snes_;
 
   bool running_ = false;
+  bool show_ppu_reg_viewer_ = false;
 };
 
 }  // namespace core