Updated main examples README to link to main docs and quickstarts

Doc Fixit: Clarifying how to install for gRPC C++

Doc Fixit: mention how to get protoc compiler in base INSTALL.md

Doc Fixit: PHP update readme

Disable profiling in qps_worker for now

Fix copyright (and master sanity)

Set grace=0 to server stop in route_guide

Add test_lite custom command for parallel test running.

Add self as SoC mentor

be a potential mentor if needed.

Put back the gflags/gtest requirement to doc

Potential fix for race condition exposed by Node

Removes confusing/unnecessary section on generating code.

Fix #5619

Fix race in poll() based pollset

Fix race between parsing messages and receiving status in Node client

Fix sanity

It was possible for entries in watchers[] to be deleted by another thread before we called begin_poll.

I'd like to do something nicer than this eventually... but that'll be easier once we've got the polling loop cleaned up (which is currently WIP)

Revert "Improve perf smoke test stability"

Revert "Pass a non-infinite deadline to grpc_completion_queue_next() to prevent queues from blocking indefinitely in poll()"