Show WAX CPU percentage used in top left corner
当前为
Uses https://nftgaming.global.binfra.one/v1/chain/get_account in order to display cpu_limit.used / cpu_limit.max as percentage
CPU usage calls are only done if the tab is considered "visible"
https://stackoverflow.com/questions/1060008/is-there-a-way-to-detect-if-a-browser-window-is-not-currently-active
