Interface for client's scripts. Similar to JEB1's IScript.
Scripts should be designed to achieve relatively short and to-the-point operations, within a
client context. Scripts have access to parts of the the client context, exposed via
IClientContext and sub-interfaces.
Note: Unlike plugins, scripts should be started on the client's main thread. In the case of the official RCP desktop client, they are executed on the main UI thread. Care should be taken to not block the main thread for extended periods of time. Long operations should take place on separately spawned pool threads.
Execute the script entry-point method.