Add crash and crashWith

[paf31]

I figured these might make useful alternatives to the usual exhaustivity error message.

[garyb]

Good thinking 👍

[garyb]

Maybe we want unsafe versions of these too, without the constraint? So we can replace the unsafeThrow things we have in places currently where we're manually verifying something is not partial? I guess unsafePartial does the same job, but having another option for defining "it's-not-partial-honest" functions with a better fail error might be useful.

[paf31]

How's this?

[garyb]

👍

[paf31]

Ok, how do I version this again?

[garyb]

v1.1.0, as it's backwards compatible new features.

[paf31]

Thanks!