message: Use imageCache to load ResourceBreakdownPanel icons
diff: #include "ResourceBreakdownPanel.h"
  +#include "../Cache.h"
  #include "../Constants.h"
  #include "../FontManager.h"
  @@ -44,7 +45,7 @@ namespace
  ResourceBreakdownPanel::ResourceBreakdownPanel() :
  - mIcons("ui/icons.png"),
  + mIcons{imageCache.load("ui/icons.png")},
  mSkin{
  Image{"ui/skin/window_top_left.png"},
  Image{"ui/skin/window_top_middle.png"},
  