Dataset kwargs for custom dataset pipeline

[dxoigmn]

Would it be possible to add kwargs to the dataset configuration? Those kwargs could then be passed along to the dataset_fn. This would enable us to work around the slow numpy dataset pipeline and integrate our extra features into the pipeline. The check for an ArmoryDataGenerator in https://github.com/twosixlabs/armory/blob/master/armory/utils/config_loading.py#L42 would need to be changed to a warning for this work.

[davidslater]

Would this be just for training or for inference time as well?

[dxoigmn]

Ideally both.