Custom start boxes modoption

[GoogleFrog]

We could add a modoption, or a series of modoptions, that allow players to override map start boxes with their own rectangles. The use case that is not covered by the current options is using shuffle start boxes on maps that do not have FFA start boxes.

[sprunk]

What do you mean by "FFA boxes"? If there are just 2 boxes they can still shuffle (ie. get swapped with 50% chance). If there are maps that have both a decent 2-box and a FFA setup possible can just get both (in which case allshuffle will use them all, for FFA, while shuffle will just use the first 2, for teams).

[GoogleFrog]

Ah sorry. The use case is that you want to play a FFA on a map without FFA boxes and you want to shuffle. If you don't want to shuffle then some coordination and "start anywhere" is probably sufficient.

[sprunk]

I think this has three subtasks:

• [ ] provide gameside config for maps that can support a FFA but don't yet have FFA boxes (related: #1414).
• [ ] add a modoption for users to provide the parsable box string. This is extremely bad UI but has the benefits of being a one liner and unlimited power so is a nice temporary solution for power users who want things not covered by the above, like 7-way shuffle FFA on DSD, until the third subtask is complete.
• [ ] add a way to draw boxes ingame. Might need some backend work (boxes are currently constant and present since the start which some logic might rely on) and design (who can draw boxes? what tools does the UI provide? how does the AI interface look like? etc).

[GoogleFrog]

For task 3 you can use set start points to confine the AIs to the boxes. Either leave this up to players or automatically force the AI start points with the gadget once the boxes are final.