Wrap exceptions from BCL to custom xFunc exceptions

[sys27]

Any exception thrown by any method from the .NET standard library is returned as is. It is better to wrap them into custom xFunc exceptions: TokenizeException/ParseException/etc. and set InnerException to the original exception whenever it is possible.

Exceptions to wrap:

• DivideByZeroException
• FormatException
• OverflowException
• KeyNotFoundException
• IndexOutOfRangeException
• InvalidOperationException
• NotSupportedException
• ArgumentNullException?
• ArgumentException?

See #766.