First cut of thread pools in fshell. Not fully working yet. Removed 4 overloads of CCommandBase::RunCommand[L] that are no longer used at all, and changed one more to not be exported as it's only used internally to iocli.dll. Added a thread pool (CThreadPool) to fshell so that thread commands no longer have to spawn a new thread every time they run. As part of this, CCommandWrapperBase now derives from CActive so that CThreadCommand can use its CActive-ness. CThreadCommand rejigged quite a bit to use CThreadPool (via MTaskRunner interface).

=head1 FShell Documentation

L<Introduction|fshell::commands::fshell/Introduction> - an introduction to fshell.

L<Getting started|getting_started> - a guide to getting fshell up and running on various different platforms.

L<Change History|fshell::change_history>

L<Core FShell functionality|core>

L<FShell Commands|commands> - an A to Z of all the commands that fshell supports.

L<Plug-ins|plugins>

L<Developer documentation|internal> - documentation for developers wishing to extend fshell or write new commands.