Refactor PowerPointAdapter to use ActionConfig

[Tom-Kingstone]

Broken rules:

As with other adapters, all actions should use an action config to determine the template and output files (see IES_Toolkit). This would allow an adapter to use different template/output files without re-instantiating the adapter with different parameters.

Suggestions to restore compliance:

Remove constructors that accept FileSettings and Stream inputs, and create ActionConfigs for these scenarios. Then modify existing actions to use the action configs instead of the private FileSettings/Stream properties. This would also make determining the actions to use (file settings vs stream usage).

This is by definition a breaking change, so versioning will be required, and ensure to update affected toolkits.