Refactor Rom for improved readability

src/app/rom.h

@@ -520,11 +520,17 @@ class Rom : public core::ExperimentFlags {
   // All graphics sheets for Link
   std::array<gfx::Bitmap, kNumLinkSheets> link_graphics_;
 
-  Z3_Version version_ = Z3_Version::US;
-
-  gfx::SnesPalette link_palette_;
-  gfx::PaletteGroupMap palette_groups_;
+  // Label manager for unique resource names.
   core::ResourceLabelManager resource_label_manager_;
+
+  // Link's palette
+  gfx::SnesPalette link_palette_;
+
+  // All palette groups in the game
+  gfx::PaletteGroupMap palette_groups_;
+
+  // Version of the game
+  Z3_Version version_ = Z3_Version::US;
 };
 
 /**