200,000 item list limit should be part of misc limits

[gradylink]

It's an incompatibility with Scratch.

[GarboMuffin]

it is very unlikely that we change this at this point

[GarboMuffin]

of all of our subtle edge-case compatibility issues that we've lived to tolerate, this is one the incompatibilities that causes the least breakage

the last time I've seen this be relevant in a real-world project was five years ago, and it wasn't even in TurboWarp - forkphorus/forkphorus#305

at this point there are probably more projects relying on the limit being removed than projects relying on the limit existing