Documentation typo: ansible-module[s]-extras

Typo: ansible-module-extras -> ansible-modules-extras in a link to this
repository.
Small fix for issue #9275
Template play vars after reading them

Fixes #9242
Revert "atfork import warning should be suppressed when system_warnings = False"

This reverts commit a175168686abedaad88051aedc2dab3d164ba792.
WIP on data structure processing patterns.
Add submodule references since v2 development will need them, the tree obviously does
not need two copies.
Work in progress on task loading.
Attribute defaults and optional accessors.
Attempt to clean up the munging functions a little.
Move over some of the parsing functions that we need.
Merge pull request #9267 from lorin/link-typo

Documentation typo: ansible-module[s]-extras
Merge pull request #9276 from CaptTofu/bug/module_doc_fix

Small fix for issue #9275
We need module args specific parsing classes.
Stub class for mod arg parsing tests.
Adding new yaml parsing classes
Adding tests for new yaml parsing stuff and adjusting imports
Add stub tests for module args parsing.
Adding a negative test for new safe_load
Make listify respect the global setting for undefined variables.

(Fixes #9008.)

With credit to jimi-c for the initial pass in this commit:
https://github.com/jimi-c/ansible/commit/b18bd6b98edecda1fcb5a85053593e78b46b9709
Fixes Arch PKGBUILD

Build was failing with new Ansible submodule setup for core and extras
modules.
Integrated fix from @firecat53
Added @firecat53 to contributors.