Strax

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- Fix bug in input synchronization

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- Use chunks with defined start/end rather than plain arrays (235)
- Mandate time fields in all datatypes (235)
- Remove unnecessary fields from raw-records (235, 237)
- Allow compute to take start and end fields (239)
- Channel-dependent hitfinder threshold (234)
- Wait on Executors during shutdown (236)
- Protect hitfinder against buffer overruns

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- Fixes for time range selection (231)
- Mailbox timeout and max_messages accessible as context options
- Fix output inference for ParallelSourcePlugin (straxen 46)
- Sane default for max_workers in multi-run loading
- run_id field is now a string when loading multiple runs

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- Small bugfixes:
- Fixes for multi-output plugins
- Use frozendict for Plugin.takes_config

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- Peak merging code (from straxen)
- time_range selection for user-defined plugins that never save
- Add hit height, store fpart-baseline corrected hit area
- Preserve cached input on empty chunks in OverlapWindowPlugin

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- Natural breaks splitting (225)
- Add ptype, max_gap and max_goodness_of_split to peaks dtype
- Fixes for multiprocessing
- Fixes for time selection
- Fix for final data in same-length merging