Improvements over the Crash Report API

[LambdAurora]

While porting the API I noticed some issues with it, especially the CRASH_REPORT_CREATION event.

The event pass CrashReport, if you want to add a new section you'll do CrashReport#addElement, but it caused crashes due to its stacktrace trimming system. This has been solved with bound checks, but I'm lead to think we probably should have a context object instead to allow our own addElement logic. Is this relevant? Would this be actually useful?