Fix crash when deleting a Menu handle during callbacks - #2536
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Fixes a crash when deleting a
Menuhandle duringMenuAction_Cancel,MenuAction_VoteCancelandMenuAction_VoteEnd, which would result in a UAF. It now invalidates the handle properly.The same applies to
MenuAction_Display,MenuAction_DrawItemandMenuAction_DisplayItemwhile paging through a menu.Also fixes a crash when
CancelVote()is called fromMenuAction_VoteStart, and removes the duplicatedAutoHandleRooterstruct.Closes #2073