message: Use imageCache to load icons in MineOperationsWindow
diff: #include "TextRender.h"
  +#include "../Cache.h"
  #include "../Constants.h"
  #include "../FontManager.h"
  @@ -18,8 +19,8 @@ static const Font* FONT_BOLD = nullptr;
  *
  */
  MineOperationsWindow::MineOperationsWindow() :
  - mUiIcon{"ui/interface/mine.png"},
  - mIcons{"ui/icons.png"},
  + mUiIcon{imageCache.load("ui/interface/mine.png")},
  + mIcons{imageCache.load("ui/icons.png")},
  mPanel{
  Image{"ui/skin/textbox_top_left.png"},
  Image{"ui/skin/textbox_top_middle.png"},
  