swappable-crash-reporting-and-dialog

Ship a build with crash reporting and a build with none from one codebase, by swapping a module that exposes three top-level functions instead of an interface, so call sites are byte-identical and the no-tracking build provably contains no reporting code. Also covers a desktop crash dialog built on the older widget toolkit, because the modern UI may be exactly what just died, and how to marshal it onto that…