Update SNESPalette, SNESColor, add tests

src/app/core/constants.h

@@ -54,6 +54,15 @@
     }                                             \
   }
 
+#define EXIT_IF_ERROR(expression)                 \
+  {                                               \
+    auto error = expression;                      \
+    if (!error.ok()) {                            \
+      std::cout << error.ToString() << std::endl; \
+      return EXIT_FAILURE;                        \
+    }                                             \
+  }
+
 #define RETURN_IF_ERROR(expression) \
   {                                 \
     auto error = expression;        \

src/app/core/pipeline.cc

@@ -30,7 +30,7 @@ void SelectablePalettePipeline(uint64_t& palette_id, bool& refresh_graphics,
       ImGui::PushID(n);
       if ((n % 8) != 0) ImGui::SameLine(0.0f, ImGui::GetStyle().ItemSpacing.y);
 
-      if (ImGui::ColorButton("##palette", palette[n].RGB(),
+      if (ImGui::ColorButton("##palette", palette[n].GetRGB(),
                              ImGuiColorEditFlags_NoAlpha |
                                  ImGuiColorEditFlags_NoPicker |
                                  ImGuiColorEditFlags_NoTooltip,