This PR was committed last night and is is major change to how lib/ts, the C plugin API, and C++ plugin API are arranged. The goal of this is to unify include paths between plugins and the TS core so that, eventually, plugins in the TS code base are not privileged compared to third party plugins by having access to headers/utilities that third party plugins do not. There is a brief write up on the new structure here - https://docs.trafficserver.apache.org/en/latest/developer-guide/introduction/header-file-structure.en.html#developer-header-files
Please feel free to ask me any questions, either via email or on IRC.
