This extracts the extra tags from any `[foo]` stuff at the end of the
version and sends them to Sentry for indexing.
If I need to modify that regexp again I'll probably write a from scratch
tokenizer and parser for our version string instead...
* lib/ur: Implement crash (panic) reporting (fixes#959)
This implements a simple crash reporting method. It piggybacks on the
panic log files created by the monitor process, picking these up and
uploading them from the usage reporting routine.
A new config value points to the crash receiver base URL, which defaults
to "https://crash.syncthing.net/newcrash" (following the pattern of
"https://data.syncthing.net/newdata" for usage reports, but allowing us
to separate the service as required).
