json_StringIsLargeNumber matching invalid numbers

[timhall]

See VBA-tools/VBA-Web#273, VBA-tools/VBA-Web#274

The function json_StringIsLargeNumber checks only if the string contains '0', 'E', 'e' or '.' characters to say if it's a number or not. So the string code like this one 012345678901234567890 is recognized as a valid Json number which in reality is not.

[jeffshieldsdev]

I have a string "............" which this function is returning True for. I'm going to update the function to explicitly check for a number character in addition to .|E|e