Add in examples and details on delayed queue tasks and running queues…

Add in examples and details on delayed queue tasks and running queues through an API style mechanism

Add Queue Reference

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>

interfaces: warn about api key uniqueness

Add help for new paths

Update information on deprecated backwards naming - issue #648

clarification on running curl as sudo

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>

Added doc for hook_civicrm_entityRefFilters

civibuild.md - Add documentation about CIVIBUILD_PATH and custom-types

Added to line 22 - "You shouldn't run the curl buildkit command as sudo. It will sudo itself for the bits that need it."

In this page and other `tools/*.md` pages, the sections use basic
capitalization.

Update Hooks Pre and Post documentation indicating Domain is now aval…

civilint.md - Split out comments on multiple lines

These examples are in a code block  - which prevents wrapping. When reading on the published site, you have to scroll horizontally.

Moving them to separate lines makes them more legible.

Updated docs for dev/core#1077

Adding examples to markdown documentation.

Explain difference between ts and E::ts a bit more

Updated docs for dev/core#870

transactions.md - Add more intro. Add API discussion.

Improve hook_civicrm_alterMailParams re: headers and flexmailer. fix #654

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>

Co-Authored-By: Mikey O'Toole <mikey@mjco.uk>