Reduce GC pressure from lambdas

async_IO_v1.6

Z80Core: less GC pressure from lambdas

NMI handling

Rework NMI handling for async io

More robust Async queue API class hierarchy.

More robust Async queue API class hierarchy.
Single side linked list in Async queue for lower GC pressure and speed

sync/async IO

async_IO_v1.1

use primitive