Fixed JENKINS-13129: Updating built-in plugins doesn't work, the file doesn't get pinned and is overwritten on the next startup

[FIX JENKINS-12994] Quiet period is blocking other jobs in queue

Added another hyperlink to the console output of a blocked matrix build configuration.
thanks

There's some expected performance gain since people often deploy
$JENKINS_HOME over NFS.

Queue#maintain() was returning too soon

[Fixed JENKINS-13129] Updating built-in plugins doesn't work, the file doesn't get pinned and is overwritten on the next startup

changed bundled plugin detection, added unit test

- Added check if running on windows to copy the web dir of the
  WebAppContext

icons after build completion.

Fix for [JENKINS-13195]

Adjust z-index for #search-box-completion to appear over the breadcrumb

Applied the change from Olav Reinert.