Override task reservations

[Vastin]

A really simple UI change - the ability to override another character's task reservation when you have someone selected and are trying to prioritize a task.

Right now I can achieve this by finding the other character, recruiting them and giving them some short term order, and then going back to my other character to give them the intended task. Obviously it'd be far smoother if I could just FORCE them to take the task from the other character in a single click.

As an aside, it'd be nice if characters had some ability to do this on their own - claiming very nearby tasks that are similar to the one they just completed, even if it means kicking a distant character off of that task - as long as it doesn't involve carrying materials. This might particularly improve efficiency for tasks like mining, cleaning, dousing fires, repairing, and the like. Right now you have a nasty tendency to see a character run out across the map, mine one or two spaces off a cliffside, and then run back because two characters waaaaay back at base have claimed the only remaining mining spots - which the nearby guy could have cleared out long before they even got there.