* RPN rules (WIP)

* RPN rules web interface, MQTT inputs

* Stickyness, rpn.ops,...

* Perform light updates only when value changes

* Improve wsSend performance

* Revert PR test

* Check TERMINAL_SUPPORT for _rpnInitCommands and remove unused variable

* Fix merge

* formatting

* disable by default (?)

* changelog

* comment

* remove debug function wrappers in favour of var activation

* fixup! comment

* clean-up ws declarations, remove old stubs

* always fw declare callback types

* wsPost is only possible with WEB_SUPPORT

* some more ws methods

- update every dynamicjsonbuffer with fixed size constructor argument
- change to ws callback registration to use a class builder (just cosmetic)
- test multiple ws data callbacks for each module
- remove some of the static strings in favour of ws data callback
- improve sensor ws callback data size, remove duplicated strings
- use static buffer in wsDebugSend
- postpone wsSend until loop, implement wsPost to allow other modules to queue message callbacks. remove Ticker based ws callbacks for data
- update WebUI files

- wrapper NTPClient class to avoid inadvertently calling NTP::getTime() while
setting things up
- only call NTP::getTime() when in loop(), install async TimeLib
sync provider and manually set TimeLib time
- randomize sync and delay times

* send all ws config at once on start
* reduce ws json overhead by creating message buffer manually
* use k:[values] instead of k1:value1, k2:value2 etc. for lists

Avoid 0 timestamp bug