fixes #1621

* Added LITESUN LA-WF3 support.

Support for LITESUN LA-WF3 / Costco Charging Essentials wall socket.

* Added LITESUN LA-WF3 support.

Support for LITESUN LA-WF3 / Costco Charging Essentials wall socket.

* LITESUN_LA_WF3 hardware.h

* LITESUN_LA_WF3 platformio.ini

* Added Teckin SP20 Power Plug

* Added Teckin SP20 to hardware

1. Add thermostat to the espurna_modules in progmem.h
2. Add thermostat to webui, gulp, html, js.
3. in general.h MQTT_USE_JSON returned to 0 by default and 1 if thermostat enabled.

* Implemented HAMA outlet model number 00176552. There is a identical one looking exactly the same but with different part number

Signed-off-by: Markus Rudolf <info@markusrudolf.de>

Added initial support for Oukitel Smart Switch. This is a 2 outlet plug
that has the same pinout as the YiDian XS-SSA05.

* 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

This reverts commit 7ad0e3a02b.

- Heartbeat mode and interval configuration added to WebUI ADMIN page
- New option HEARTBEAT_REPEAT_STATUS: on device startup full heartbeat information and after HEARTBEAT_INTERVAL only STATUS report.
- Enhanced first heartbeat message - on device startup it will send heartbeat after ntpSynced will be true to get device time.

P.S. Code is tested. Web part is not compiled, and not tested. I hope it will work :)

* Merge RF and RFBridge code

* Keep rfbridge.ino filename

* Corrected #if checks

* Make RF_DEBOUNCE and RF_LEARN_TIMEOUT configurable

* Fix compile warnings with platform_latest