Greater control over bots

[krestenlaust]

Ideas:

• Skip the rest of move calculations, and just use what is already calculated (if stuck on e.g. 7th out of 10 moves)
• Manual moves, possibly by showing the possible moves ranked instead of just moving automatically
• Greater details during calculation, e.g. show what move is being worked on, either in text or visually on the board

Benefits:

• Makes it easier to 'debug' the bot
• Interesting implementation difficulties
• Could evolve into an analysis mode similar to the ones available on Lichess and Chess.com