add stop operation for animation.

Signed-off-by: Curno <lyf.curno@gmail.com>
update group and sequential animation.

Signed-off-by: Curno <lyf.curno@gmail.com>
ui updated.

Signed-off-by: Curno <lyf.curno@gmail.com>
update discard animation

Signed-off-by: Curno <lyf.curno@gmail.com>
fixed a memory bug

Signed-off-by: Curno <lyf.curno@gmail.com>
refactor.

Signed-off-by: Curno <lyf.curno@gmail.com>
replace ref<VisualCard> with VisualCardRef

Signed-off-by: Curno <lyf.curno@gmail.com>