[JENKINS-20280] Make it easy to change the implementation. Especially Map.Entry is not so convenient to handle.

thanks to kutzi for spotting this.

Incorporated Stapler 1.222 to pick up fixes

Conflicts:
	core/src/main/resources/hudson/model/UpdateCenter/RestartJenkinsJob/Running/status_de.properties
	core/src/main/resources/hudson/model/UpdateCenter/body_de.properties
	core/src/main/resources/hudson/model/UpdateCenter/index_fr.properties
	core/src/main/resources/hudson/model/View/sidepanel_cs.properties

Conflicts are resolved in favor of the master branch, assuming people
editing the core is more trustworthy.

This reverts commit b354bca0.

Unfortunately, Afrikaaans is the default selection of the language, and
some people apparently contributed translations without selecting the
proper locale. I see some Hebrew text in here, which was easier to
distinguish because it uses an entirely different character set.

But I have to assume other locales are mixed in here as well.

I'll remove the default language from the translation assistance plugin.
But in the mean time, we don't have anyone who's capable of reviewing
this, so I'm forced to roll back.

(es)

Otherwise a REST API user needs to scan through a couple pages of HTML to find the actual message.

This behaviour is noted in MapOptionHandler.

Optimize and close Zip resources in ClassicPluginStrategy and FilePath

Merged pull request #931.

Changed so that each nobuilt, aborted and disabled will use icons with unique names. The Icons used in this patch are just a copy of grey.

Debian cleanup

The bulk of the change will be in Maven plugin

... after looking at pull request #957.

... as pointed out by https://github.com/jenkinsci/jenkins/pull/961

This reverts commit d45d18ed.

Merged pull request #962.

Technically we should doing so only after the server reported success, but unfortunately there's no good hook for that.

Merged pull request #966