Implement default methods in TaskListener and BuildListener

* [JENKINS-47718] - Deprecate User#getUser(String)

`User#getUser(String)` method causes lots of confusion for plugin developers. It implicitly creates a user if it cannot be found, and in many cases this is actually a not-expected behavior. This change deprecates the method and to creates a new `User#getOrCreate()` which is more explicit

* [JENKINS-47718] - Address comments from @jglick

* [JENKINS-34138] Adding equals/hashCode methods so that installs don't step on each other

* [JENKINS-34138] Added issue reference to unit tests

* [JENKINS-34138] - changed the order of equals / hashcode

[JENKINS-39179] [JENKINS-36088] Always use NIO to create and detect symbolic links and Windows junctions (#3133)

* Always use NIO to detect symlinks

* Make assertion failure message consistent

* Catch NoSuchFileException to keep tests passing

* Make method name more specific and simlify assumption

* Remove obsolete comment and reword the main comment in isSymlink

* Deprecate Kernel32Util#isJunctionOrSymlink

* Use assumptions for junction creation and add messages to assumptions

* Replace deprecated code with recommended alternative

* Add comment explaining call to DosFileAttributes#isOther

* Do not fall back to native code when creating symlinks

* Log FileSystemExceptions when creating symbolic links

* Catch InvalidPathException and rethrow as IOException

* Deprecate Kernel32Utils#createSymbolicLink and #getWin32FileAttributes

* Preserve original logging behavior on Windows and remove useless call to Util#displayIOException

[JENKINS-47909] Handle false hex escapes

[JENKINS-12251 follow up] Switch to the non-deprecated variable

* [JENKINS-47115] - Add trim option to String Parameter

* Add help information

* Address comments

* Address comments

* Address comments

* Address comments

[JENKINS-47768] - Avoid having "authenticated" twice in the group membership of a user (LastGrantedAuthorities) (#3123)

* Avoid having "authenticated" twice in the group membership of a user
- this occur when the SecurityRealm potentially already grants that role (like in github-oauth-plugin)

* - changed as requested by Oleg
- the list has a maximum of roles.length and in reality it's either roles.length or (roles.length-1), so the maximum is ok

* - fix problem of missing the "authenticated" authority

* - convert the Groovy script to a Java version
- the Groovy test was not run by default (IIUC Groovy scripts are not compiled if placed in java src folder)

Fix "Manage Jenkins" icon on Global Tool Configuration

Update Remoting from 3.13. to 3.14

* Fix JDKInstaller to work with old and new Oracle login flow

* Update Javadoc to explain that both login flows are supported

All "Manage Jenkins" links from different pages use gear icon except this one.

Add @since for User.getById

[JENKINS-47940] Specified nodes count can be invalid

Fixes JENKINS-45294, JENKINS-47425, JENKINS-47901, JENKINS-47942 + about 50 reported FindBugs issues (JENKINS-37566). There are 13 FindBugs issues left, work in progress.

Add Chinese translation

* JENKINS-42852 add caching options for captcha

* - remove whitespace

* - correct unit tests

* - copy/paste is bad

* - second edit...

[JENKINS-47015] - Update Windows Slave Installer module to 1.9.2

[JENKINS-47909] @daniel-beck asks about usernames containing valid $ escapes. Behavior is partly broken.

- to ease the maintenance of plugins (avoid searching for first version providing it)

Correction French translation

It picks new release with one bugfix / performance improvement. Changelog: https://github.com/jenkinsci/windows-slave-installer-module/blob/master/CHANGELOG.md#192

Change one translation in French (in english: title was used instead of labels, misleading as for slaves it's labels)

[JENKINS-6290] Add New View link to sidebar