v0.6.0 for RN 0.64.x

This release brings ~350 commits worth of bugfixes and improvements, and is aimed at the upcoming 0.64 branch of React Native.

Among them are correctness and performance fixes in regex, parsing improvements and native support for more JS features, a JS memory leak fix, and a new NPM that aims to help build React Native apps that target macOS instead of mobile. It also includes everything from patch release v0.5.1, notably, the unstripped Android libraries to help with native debugging and symbolication.