IsTradeContextBusy() depreciated in MQL5?

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I've noticed IsTradeContextBusy() one of the most commonly used functions is now no more in MQL5.

Is there a new way to test if the expert advisor can execute an order or not?

There are also other depreciated functions that do not have MQL5 equivalents. Those are:

int ArrayDimension()
int ArrayCopySeries()
double AccountFreeMarginMode()
void HideTestIndicators()
int WindowFind()
int FileOpenHistory()
int AccountStopoutLevel()

If you know the MQL5 equivalents of the functions, please do let me know. Thanks!