SPI & PBPZ: Investigate hook subscription management

[HunterZ]

May be worth selectively unsubscribing from hooks in one or both plugins.

In particular, PBPZ shouldn't be listening to damage hooks if using TruePVE's new API.

Also, SPI could potentially stop listening to plugin-specific PVP delay hooks for plugins that use TruePVE's API, although this would require some kind of efficient state management/modeling (maybe a dictionary of resolved modes per plugin or something), since it would probably have to do a minimal state check on every hook call? Edit: Or just implement a hook call in DPVP & PBPZ OnServerInitialized() to advertise use of TruePVE's API, so that SPI can unsubscribe once and not worry about it?

[HunterZ]

This may not be as useful as I thought?

SPI: This doesn't seem to take a huge hit from hook calls.

PBPZ: The biggest hits here are building/shelter/tugboat spawn/kill hooks. It's not going to make sense to dynamically toggle subscriptions for these: Dynamic subscriptions can't be controlled on a per-overload basis, so PBPZ will always be subscribed as long as there is at least one base zone of any kind.