Mostly bugfix and maintenance release:
Features:
- Implement GC for iterators - remove stale iterators (#208)
Performance:
- Move away from query graphs to query plans (#191)
- And improve their performance (#194)
Correctness:
- Fix Undefined Behaviour when getting a memory map size (#188)
- Add support for 2gb+ iterators (fix signed i32 overflow) (#202)
Refactoring and maintenance:
- Bump catch v2.2.2 -> v2.13.10 (#192)
- Disable clang-tidy, which has become very noisy (#193)
- Add performabce counters for unique ngram reads (#199)
- Remove dead code accrued over the years (#200)
