Ffpuppet

- Add back support for ASAN_SYMBOLIZER_PATH
- Support utf-8 in CheckLogContents()

- SanitizerOptions updates

- Always pack rr trace
- Set default report_objects=1 (LSAN_OPTIONS)

- Force set 'network.proxy.failover_direct=false'

- Update top level `__all__`

- API changes
- Set `soft_rss_limit_mb=5000` to help detect issues and avoid system OOMs
- Set `max_allocation_size_mb=512` to help detect issues and avoid system OOMs
- Add ability to specify global working directory
- Add Pernosco debugger option
- Include 'taskcluster-build-task' in rr trace if available