PTLC Code Review

@georgezgeorgez has submitted a PR for PTLCs. George has asked the community to review the code.

George has provided a background resource here: PTLCs: The Standard(?) to learn more about PTLCs. According to the last dev meeting, @sumamu reviewed the code but still had some questions.

@aliencoder has requested a code review meeting to ask questions. I will use this post to help facilitate that meeting. Stay tuned.