Read process memory doesn't retrieve bytes correctly

[cromachina]

This function https://github.com/JeanExtreme002/PyMemoryEditor/blob/master/PyMemoryEditor/linux/functions.py#L70
(and the similar windows version) are retrieving data.value, which is not correct when you want bytes from ctypes.create_string_buffer.

This should instead be:

    if pytype is str:
        return data.value.decode()
    elif pytype is bytes:
        return bytes(data)
    else:
        return data.value

If you just return value, it returns cut off bytes, as if it's stopping at null terminators.