Increment actor generation on cloak.
Fix Cloak style nits.
Simplify cloak crate behavior.

This removes the runtime trait addition which
prevented Cloak from being cached.

The CloakCrateAction in D2K was never used, so
has also been removed.
Fix cloak detectors revealing for everyone.

They now only reveal for their owner and their allies.
Avoid unnecessary Mobile lookups in Follow.
Check ITargetable when deciding target validity. Fixes #3659.
Unacquire invalid AI targets.
Merge pull request #3726 from pchote/cloak-fix

Cloak fixes