* Remove old code for string class (no longer needed)
Signed-off-by: Stefan Weil <sw@weilnetz.de>
* Add std namespace to string class
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Assertions are good for programming errors, but not for wrong user input.
The new code no longer needs File::ReadFileToStringOrDie, so remove that
method.
Signed-off-by: Stefan Weil <sw@weilnetz.de>