Ipyflow

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* Misc bugfixes and improvements;
* Ignore mutating calls when determining fresh cells;
* Experimental reactivity prototype;

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* Improve loop performance by better enforcing trace-once semantics;
* Bugfix for stack tracking when tracing reenabled;

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* Add exceptions for general mutation rules;
* Fix return transition when first call happens outside notebook;
* Shuffle namespace symbols from old to new when namespace overwritten;

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* Improved slicing via timestamp-augmented liveness analysis;
* Bugfix to dedup slice computation;
* Bugfix to avoid resolving null symbol;
* Bugfix for improper class namespace registration;
* State transition bugfix for return from ClassDef;
* Misc improvements to mutations;
* Improved bookkeeping for list insertions / deletions;

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* Minor logging fix;
* Minor no-op detection fix;
* Minor security fixes in npm packages;

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* Actually fix nbclassic bug;
* Slight improvement to the lineno -> FunctionDef mapping (fixing some bugs);