Include more status information in Deep Learning tools

[RossSmail]

The Deep Learning toolset is great, but it would be great if the Detect Objects using Deep Learning tool reported its status in more detail (at least optionally). As an example, I have started it running against a mosaic dataset containing 30,000 images, which it is processing individually, and the screenshot shows the status information I have received 4 hours in (ie, None). I have done some testing against a smaller mosaic with 68 images in it, and have calculated that it should take c. 6 hours, but obviously having some feedback on how many images it has processed and/or how many objects it has detected would be useful - some prediction of when it might finish would also presumably be possible and would be a useful addition.