Fixes#9113.
Adds sentry reporting, plus helper functions, for kmc. Includes the
now-standard `-sentry-client-test-exception` command line parameter,
with `kmcmplib` and `event` sub-options available.
Uploads kmc* sourcemaps to sentry on a release build.
On Windows, honours the registry setting for error reporting. Also
includes a command line option `--[no-]error-reporting` (must be used
prior to initial command, e.g. `kmc --no-error-reporting build ...`).
b435471b24