deployer: configure, start, stop single peer components by name via operations

[jbohren]

This PR adds three new operations to the deployer which allow lifecycle manipulation of components by name:

• bool configureComponent(string)
• bool startComponent(string)
• bool stopComponent(string)

This is useful for writing orocos scripts where you want to configure/start/stop one or more components with a name which is determined at runtime.

[jbohren]

Since this only adds operations, is it ok to merge?