r2.0.12

1. optimize: administrator's ticket list page support delete ticket
2. optimize: ticket detail page support creator retreat and close ticket
3. optimize: ticket detail page support display modal when click handle button
4. optimize: ticket list api support query child ticket
5. optimize: ticket list page support display child ticket
6. bug fix: date type field have not fill can not be submit
7. bug fix: force alter ticket's state have not trigger notice hook
8. bug fix: alert modal switch can not open when edit workflow's transition