Better bounty (0.25.4)

Thank you everone who's contributing suggestions, ideas and bug reports! This first patch since the launch is an implementation for the current top suggestion: "Bounty sets". - In this patch the bounty system has been rework to be both simpler and more flexible. Instead of assigning bounties to things, you now configure bounties for each of your trainee Derklings. This opens up for lots of fun things to explore, for instance you can configure one of them to focus on healing a specific teammate, or create defensive Derklings that prefer to stay at home. - You can now have multiple training configurations, and they each have their own set of bounties associated with them. - And finally, you can now schedule training of these configurations to make it even easier to train your Derklings exactly as you want them!