Add support for optional parameters for deataching plugins

[Rutherther]

When plugins are being deatached, certain operations such as removing commands can be done. These operations should not happen every time so some kind of parameters to enable/disable them would be nice.

The command could be something like /plugins detach name: options:"remove-commands". The parameters should be passed to the plugin somehow. Perhaps a new argument should be added to the Stop method. Maybe parameters could be incorporated to attach and refresh as well and used in the future.