Retire Start-FarJob (PowerShellFar)

[nightroman]

The cmdlet Start-FarJob is going to be removed soon. It is useful in some
cases but not really needed with several alternatives available.

Alternatives

(1) Create a new PowerShell instance and use BeginInvoke.
This effectively covers most of known practical cases.
This is what Start-FarJob uses itself.

(2) Use Start-FarTask. It lacks opinionated features of Start-FarJob but
overall it is much more powerful and covers what Start-FarJob does in its
own ways, up to developers.

[nightroman]

Start-FarJob was removed in PowerShellFar 9.0.11

Search-Regex.ps1 migrated from Start-FarJob to Start-FarTask.