fix #1108 - introduce LogProxy as an intermediary between the TextWriter; move the sync to there - allows safe detach from the logging (#1116)

* rework how pubsub handlers/queues are stores and activated
- switch to linked-list for queues
- use alloc-free path for all handlers invokes

* defer writing to the queues until we've released the subscriber lock

additional for #1101 - make sure the queue gets marked as completed when unsubscribing; simplify the way unsubscribe works for CMQ - remove the ForSyncShutdown concept and just mark completed directly

test and fix for #1101 - Unsubscribe[Async] with null arg should wipe both trusted and non-trusted subscribers

Tiny punctuation change

Tiny punctuation change