[FIXED JENKINS-26208] Do not skip polling while quieting down

[JENKINS-27414] Don't offer to restart if unsupported

[FIXED JENKINS-26751] Do not run /script on offline slave

[FIXED JENKINS-21322] Configure periodic ws cleanup

[JENKINS-20989] PeepholePermalink RunListenerImpl oncompleted should be triggered before downstream builds are triggered

This reverts commit fe1a1487.
It's been about a month, so I think it has served its purpose.

[JENKINS-26698] Localization follow-up

[JENKINS-27392] SimpleBuildWrapper.createLoggerDecorator

Allowing some methods to be overridden, with the caveat that the overrides will not be called from CoreWrapperStep.

Update README.md; Grammar/Spelling, recommended license format

Fix load statistics description

Allow control over the creation of different TopLevelItems from the ACL