Add Control '[NFX]: Failed to load data..' annoying printing issue with flag value.

[jwhwangbirdview]

Problem

while netfox is setting, '[NFX]: Failed to load data..' error statement keeps displaying all over the console.

Sceenshot

Solution

This issue is already reported by @iVaschee ( #249 )
but no one suggests good solution for this. and i tried debugging the problem
so what i suspect is Data(contentsOf: fileURL) part has a authority-to-access problem or some address issue.
I cannot find the good solution for this without change the core logic other than just controling printing with flag.

public static func setDebugErrorPrintEnabled(with enabled: Bool) {
        debugErrorPrintEnabled = enabled
 }

I think right now the logic is not affected by this kind of flag-controlled logic.
'[NFX]: Failed to load data..' error is so annoying and making it hard to see other invaluable logs.
So I hope to be confirmed this alternative code. Thanks

[wrutkowski-tyro]

#244 is fixing the same thing