Stop npm deprecate now all modules are deprecated (#4690)

Signed-off-by: Simon Stone <sstone1@uk.ibm.com>

[Master] expose clientIdentity in getNativeAPI (#4617)

Signed-off-by: Dave Kelsey <d_kelsey@uk.ibm.com>

[Master] Move experimental features to 0.20 (#4593)

Signed-off-by: Dave Kelsey <d_kelsey@uk.ibm.com>

[0.19.x] cache enableHistorian flag (#4574)

Signed-off-by: Dave Kelsey <d_kelsey@uk.ibm.com>

[Master] ensure logging files are flushed for CLI (#4480)

Signed-off-by: Dave Kelsey <d_kelsey@uk.ibm.com>

[Master] Experimental Pluggable Query Handler (#4537)

This is an experimental feature for composer and as such is not documented.

Signed-off-by: Dave Kelsey <d_kelsey@uk.ibm.com>

[0.19.x] Rest server can be terminated by client (#4531)

A client listening on a web socket can terminate the rest server
if it is badly behaved and doesn’t cleanly disconnect

Signed-off-by: Dave Kelsey <d_kelsey@uk.ibm.com>

[Master] Allow txid to be passed to query requests (#4500)

Signed-off-by: Dave Kelsey <d_kelsey@uk.ibm.com>

[0.19.x] Allow txid to be passed to query requests (#4499)

Signed-off-by: Dave Kelsey <d_kelsey@uk.ibm.com>

[Master] Improve perf logging (#4495)

* Log connect/disconnect, improve query perf log

Signed-off-by: Dave Kelsey <d_kelsey@uk.ibm.com>

* Improvements based on example

Signed-off-by: Dave Kelsey <d_kelsey@uk.ibm.com>