_GET_PAUSE_MENU_SELECTION_DATA

lastItemMenuId: this is the menuID of the last selected item minus 1000 (lastItem.menuID - 1000)
selectedItemMenuId: same as lastItemMenuId except for the currently selected menu item
selectedItemUniqueId: this is uniqueID of the currently selected menu item
when the pausemenu is closed:
lastItemMenuId = -1
selectedItemMenuId = -1
selectedItemUniqueId = 0
when the header gains focus:
lastItemMenuId updates as normal or 0 if the pausemenu was just opened
selectedItemMenuId becomes a unique id for the pausemenu page that focus was taken from (?) or 0 if the pausemenu was just opened
selectedItemUniqueId = -1
when focus is moved from the header to a pausemenu page:
lastItemMenuId becomes a unique id for the pausemenu page that focus was moved to (?)
selectedItemMenuId = -1
selectedItemUniqueId updates as normal