allow voice acting manager to handle non-wingman personas

[Goober5000]

Augments the voice acting manager to handle non-wingman as well as wingman personas, plus limit operations to a specific persona. This also modifies the editor to only increment the number of modifications when something is modified, not merely when something could be modified but is currently the expected value.

Resolves #6379. ~~In draft pending acceptance from the requestor.~~