Package functionality

[awenonian]

Not sure this is actually ready to merge, but I'm gonna open this anyway, to track what's left:

• [ ] (optional) Implement police chasing for contraband. This needs some design work before dev can happen
• [ ] (optional) Design/dev more intuitive way to select target destinations for packages
• [ ] Decide what should happen when you've stretched magnetic packages to their limits, and can't pick them up again.

The last one is actually kinda difficult. It's easy to get magnetic packages into a spot where couriers would only pass them going away from the other package (in fact, it's often likely, since being on a path away from the other package is probably what made it drop in the first place). I keep thinking of options that wouldn't actually stop you from softlocking yourself. Best I have is to remember the last "safe" node, if we can figure out how to define that, and reset to there. Might take some good visual design to explain why your package goes back to what might be a very far away node, though.

[eamondo2]

For item 3 on your list there, we could just snap the package to the last valid point on the route that the courier was traveling. Doesn't need to be a node necessarily, since couriers will pick up even if the package isn't on an actual intersection. re-read your note, yeah that's actually harder than I'd thought at first glance

[awenonian]

To explain for posterity, the issue is that, if you naively snap them back to the last node they touched, then you could imagine that one of those nodes is one where couriers only go north from it, and the other couriers only go south from it, so there are no options for bringing the packages back towards each other. This is actually a problem for the nuclear packages too, but those just blow up when they touch, so we can just put them back at their starting destination. Spitballing some solutions:

• Could just do it with level design. Don't design a level where softlock is possible (seems difficult, and an ongoing cost)
• Could do something like the last node from which the packages were moving towards each other (no guarantee such a node exists, and would likely feel random to players)
• Could just have them do some bouncy spring animation that sends them back to their start positions (honestly, most reasonable to me, but animation needs some work)
• Could have them instead of being dropped, get dragged around by the other one (kinda interesting, need to make sure it doesn't get softlocked to an unreachable place (like off road), or maybe visually through buildings, but should be workable)