[FIXED JENKINS-31055] Make Node implement Saveable

Trim display name before applying it

The current implementation is not robust against blank display name

Seems rather unlikely, but none the less it is a possibility. Not sure how we should handle this though:

* We do not want to hold the Queue lock while performing I/O as that will grind everything to a halt
* We do not want a big fat lock on all nodes
* If we have a per-node lock then the save everything method may have to grab them all

In short, it gets ugly real fast.

For now, I believe that the risk is very low as releasing a lock does not intrinsically deschedule a currently running thread so the likely course of events is that the thread will release the lock and at least start the save before a competing thread could acquire the lock update remove the node release the lock and delete the node's directory

Use of class Base64 in a static way

- Also tidy up some of the mess logic in both #1866 and #1860

Jenkins.updateNode(): Call getQueue().scheduleMaintenance() to be sure to update builds in the queue with the change done in the node (+  Add since 1.634)

pt_BR translation

Add de translations for TimerTrigger

add '*.swp' (Vim recovery files) to .gitignore

This pull request integrates https://github.com/jenkinsci/jenkins/pull/1510

[JENKINS-28192] SecretRewriter.rewriteRecursive fails to resolve symbolic links on Windows

[JENKINS-30456]Executable can be null in getEstimatedDurationFor

[JENKINS-5253] Allow case insensitive patterns in Artifacts Archiving

This pull request integrates https://github.com/jenkinsci/jenkins/pull/1712

This pull request integrates https://github.com/jenkinsci/jenkins/pull/1769

[FIXED JENKINS-30502] trim job name upon rename

[FIXED JENKINS-30730] Prevent ClassCastException in Abstractbuild::reportError() if the build step is not Publisher.

This pull request integrates https://github.com/jenkinsci/jenkins/pulls/1851, which is a reworked version of https://github.com/jenkinsci/jenkins/pull/1846 from @fbelzunc (no original codelines left)

[JENKINS-30820] pick up the new bytecode-compatability-transformer

The new version of the BCT does not generate stackMap if the original code
did not contain stack maps.  Further more the new version takes a
classloader to use so that it can load classes when searching for the
common parent class.