Dungeon Room Object refactor

src/app/emu/video/ppu.cc

@@ -424,7 +424,7 @@ void Ppu::ApplyEffects() {}
 void Ppu::ComposeLayers() {}
 
 void Ppu::DisplayFrameBuffer() {
-  if (!screen_->IsActive()) {
+  if (!screen_->is_active()) {
     screen_->Create(256, 240, 24, frame_buffer_);
     rom()->RenderBitmap(screen_.get());
   }

src/app/emu/video/ppu.h

@@ -273,7 +273,7 @@ class Ppu : public Observer, public SharedROM {
     clock_.SetFrequency(kPpuClockSpeed);
     frame_buffer_.resize(256 * 240, 0);
     screen_ = std::make_shared<gfx::Bitmap>(256, 240, 8, 0x100);
-    screen_->SetActive(false);
+    screen_->set_active(false);
   }
 
   // Resets the PPU to its initial state