让Duilib完美支持gif

[{"title":"（7个子文件24KB）让Duilib完美支持gif","children":[{"title":"UIGifAnim.cpp <span style='color:#111;'>6.20KB</span>","children":null,"spread":false},{"title":"UIRender.h <span style='color:#111;'>2.50KB</span>","children":null,"spread":false},{"title":"UIRender.cpp <span style='color:#111;'>90.34KB</span>","children":null,"spread":false},{"title":"UIDlgBuilder.cpp <span style='color:#111;'>20.82KB</span>","children":null,"spread":false},{"title":"UIlib.h <span style='color:#111;'>3.89KB</span>","children":null,"spread":false},{"title":"UIGifAnim.h <span style='color:#111;'>797B</span>","children":null,"spread":false},{"title":"UIDefine.h <span style='color:#111;'>10.65KB</span>","children":null,"spread":false}],"spread":true}]