message: Use imageCache to load icons in StructureInspector
diff: #include "StructureInspector.h"
  +#include "../Cache.h"
  #include "../Constants.h"
  #include "../FontManager.h"
  #include "../Things/Structures/Structure.h"
  @@ -23,7 +24,7 @@ static const Font* FONT_BOLD = nullptr;
  StructureInspector::StructureInspector() :
  btnClose{"Close"},
  - mIcons{"ui/icons.png"}
  + mIcons{imageCache.load("ui/icons.png")}
  {
  text(constants::WINDOW_STRUCTURE_INSPECTOR);
  init();
  