+doc #15542 Change FSM doc rst file to correctly specify None value for infinite timeout rather than Duration.Inf
=act #16199 fixed missing predicate delegation
=act #15991 delay sending of ACK until we have updated pendingWrite

Otherwise, the user-level actor may already have sent the next chunk before
the pendingWrite has been updated and the TcpConnection will reject it.
(cherry picked from commit 96758e6)
=tcp #15766: Workaround for Windows to detect TCP abort
(cherry picked from commit 9340215)
=doc Fix wrong rst format
+act #15956 Allow _ in ActorSystem name

(cherry picked from commit 7ef1334192de6f2c0cffbb81be620cdd56110ad5)