Rules RPN (#1984)
* 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