Assign kegs/casks for automatic racking of pints etc. for POS order fulfilments

This would work well in conjunction with Mark vessels/tanks/casks as "available to rack to order" so I’m linking these together.

This is something that’s been on the radar for a while, but it’s not been started yet. Before we had the community for feature requests, we had a tool for logging them that only we could see. We’re phasing this tool out completely; in favour of all feature requests being publically viewable here on the community, so we need to ensure everything is here and able to receive votes.

@daman-singh and @john-cussons I can see that you’ve not voted for this yet. If this is in your top-20 requests, please give it a vote. If you’ve run out of votes, you may wish to remove a vote from something less important and allocate it to this instead. See Why do I only have 20 votes for how to do this.