Arguments should be validated after all arguments are parsed, not during parsing

[akamsteeg]

AtleX.CommandLineArguments/src/AtleX.CommandLineArguments/Parsers/CommandLineArgumentsParser.cs

Lines 65 to 73 in e10246d

	var isValid = validationHelper.TryValidate(currentProperty,
	argumentIsSpecified,
	argumentValue,
	out var validationErrors);
	if (!isValid)
	{
	allValidationErrors.AddRange(validationErrors);
	}

We validate an argument as soon as it's parsed, but we should defer that until after all arguments are parsed. That gives validators the possibility to be conditional, e.g. "if argument A is true, argument B should be either 1 or 2 but not 0".

This means we should also give the complete Arguments object to ValidationHelper and pass it on to the ArgumentValidator too. That makes this a breaking change.