* [hir] Core data types and lowering for new model
* Handle more expressions, including using babel for binding resolution
* test setup with pretty printing of ir
* Basic codegen and improved pretty printing
* avoid else block when if has no fallthrough
* emit function declarations with mapped name/params
* start of scope analysis
* saving state pre-run
* add slightly more complex example and flush out lowering/printing (jsx, new, variables)
* Various improvements:
* Convert logical expressions (|| and &&) to control flow, accounting
for lazy evaluation semantics.
* Handle expression statements
* Improve printing of HIR for unsupported node kinds
* Handle more cases of JSX by falling by to OtherStatement to wrap
subtrees at coarse granularity.
* improve HIR printing, lowering of expression statements
* handle object expression printing
* improve IR model for values/places along w codegen
* more test cases
* start of mutability inference
* passable but still incorrect mutability inference
* improved mutability inference, should cover most cases now
* visualization of reference graph
* correctly flow mutability backwards (have to actually set the capability)
* separate visualization in output
* consolidate on frozen/readonly/mutable capabilities
* cleanup
* conditional reassignment test (not quite working)
* hack to output svg files for debugging
* handle conditional reassignment
* improve capture analysis
* treat jsx as (interior) mutable; handle memberexpression lvalues
* lots of comments; hook return is frozen
* update main comment
* inference for switch, which reveals a bug
* fix yarn.lock