[FIXED JENKINS-18224] Introduced TransientActionFactory.
Need to fall back to it.actions for compatibility with e.g. View/sidepanel.jelly.
Merge remote-tracking branch 'origin/master' into TransientActionFactory-JENKINS-18224
[JENKINS-18224] Introduced Actionable.replaceAction, allowing getActions() to be deprecated except for subclasses.
Merge branch 'master' into TransientActionFactory-JENKINS-18224
[JENKINS-18224] Preparing to merge #1059.
Merge branch 'master' into TransientActionFactory-JENKINS-18224
Fixing Actionable.replaceAction.
Merge pull request #1059 from jglick/TransientActionFactory-JENKINS-18224

[JENKINS-18224] TransientActionFactory