Add nonStrict subscribe/unsubscribe

Change defaults

Merge pull request uNetworking#1185 from uNetworking/v19

v19

Add resetIdleTimeoutOnSend

Add closeOnBackpressureLimit option

Send back connection close header

negotiateCompression has to be static inline

Disallow windowBits=8 negotiation due to Zlib bug

Fix publish with ded. compr. compress = false

PROXY parsing has to be done as part of every getHeaders