forSubscriber needs to act like set_intersection

* fix uNetworking#1269

* Update TopicTree.h

* improve performance

* cleanup

* indent

* move variables

* latestMatch

* group emitted messages

* whitespace

* typo

* improve performance

Fix calculateIdleTimeoutCompnents

Do not append / to root-level topicNames

Make conceptual pub/sub changes for v19

Remove unused Multipart functions

Use uSockets v0.7.1

Add nonStrict subscribe/unsubscribe

Change defaults

Merge pull request uNetworking#1185 from uNetworking/v19

v19

Add resetIdleTimeoutOnSend