Add option to write crash dump on unhandled exception on Windows

[hardliner66]

While thinking about #57, I remembered that its possible to write *.dmp when an unhandled exception occurs. This adds a setting for windows users, that controls if a dump is written or not.

If the exe was built with debug infos (RelWithDebInfo), the dump can be loaded together with the corresponding *.pdb file in WinDbg, which can then be used to further analyze the dump.

Checklist

• Tested the change ingame
• Changed no physics that affect existing maps

[SollyBunny]

I feel like this should be upstreamed

[hardliner66]

@SollyBunny probably, but because this is a fork of ddnet, github doesn't let me create a fork of this repo and of ddnet at the same time, making it a bit of a pain to work with both. I mostly added it to help with #57, but I might try adding it upstream as well. For upstream I think it would be nice to have something that works on linux too (e.g.: crashpad or something similar), but for that I would need to take more time to look into the whole topic.

[SollyBunny]

"Forks" are only a github thing, git lets you have as many upstreams as you want

git remote add tater https://github.com/sjrc6/TaterClient-ddnet
git fetch tater
git checkout tater/master
git switch -c tater_feature
git push origin HEAD:tater_feature
git checkout my_ddnet_feature
git pull ddnet master
git push origin

[SollyBunny]

Chillerdragon has been pushing for easy crash dumps for post mortem debugging, I don't know what that looks like in the head of the maintainers, but make a pr and see it would probably spark some discussion atleast

[hardliner66]

Yeah, I know that git itself can deal with this, but given the limited implementation I didn't think it was worth the effort.

For upstream it might even make sense to use something more sophisticated (automatic upload, crash Dialog with button to open a new git issue, etc.).

But you're right, having a starting point to spark a discussion would definitely be a good thing. And in the end, having something simple like this might still be better than having nothing at all. I'll create a PR for upstream later when I'm back on PC.