#385 Add limits

[mzuenni]

implement some more limits.

Fixes #385

[mpsijm]

Haven't tested it yet, but here are some first comments based on the code 😄

[RagnarGrootKoerkamp]

No time to look at the code yet, but I could imagine the -m argument still being useful to override the yaml key for quick testing purposes?

[mzuenni]

but should the yaml key override it or be an additional limit (i.e. we take the min of both) and should that be for submissions or all subprocesses... ?

[mzuenni]

I think everything should work now, @mpsijm do you have time to give it a try? :)

[mpsijm]

I've used your branch today when preparing some problem ideas for the Freshmen Programming Contests, and it didn't crash 😄 I used at least bt run, bt generate, bt validate, bt constraints, and bt fuzz. Note that I haven't actually touched any of the new limits yet, nor did I explicitly try to push a submission/generator/validator past the time/memory/output limit (I only had some TLE submissions). But some testing is better than no testing, I guess 😛