[Feature Request] IPC

[zbee]

Implementing an IPC to expose any actions that are set to be re-targeted would be very helpful for discovering conflicts between Reaction and any other plugins that similarly re-target actions.

I imagine that a list of Action IDs that are at the top of an active stack, or appear within a stack for certain targets, would be the bulk of what is needed, but also perhaps just a boolean of whether All Actions, All Harmful Actions, or All Beneficial Actions are included in an active stack.

[zbee]

@UnknownX7 I at least could make use of this, and am working on a project for my own plugin that would make use of this (notifying users of targeting conflicts).

If this sounds like a fine idea to you, I could open a PR to add this.
Please do let me know if I should go ahead with it.