Added new triggers for rules: `VARx#STATE` and `MEMx#STATE`
These new triggers allows to execute commands when VARs or MEMs change their values.
This is useful for automations where the parameter sent to Tasmota by MQTT is a SetPoint for example.
Before these triggers, the approach was using an `EVENT` to store a value but some components in home automation softwares can't use `cmnd/sonofftopic/EVENT SETVAR=25`, where `cmnd/sonofftopic/EVENT` is the mqtt message and `SETVAR=25` is the payload.
With this new triggers, it will be as simple as `cmnd/sonofftopic/VAR 25` so any automation software can use it.
_(Using `cmnd/sonofftopic/EVENT SETVAR=` as mqtt message and `25` as payload is not understood by Tasmota)_
6.4.1.2 20181228
* Change switch driver making it modular and introduce input filter (#4665, #4724)
* Add define DS18B20_INTERNAL_PULLUP to select internal input pullup when only one DS18B20 sensor is connected eliminating external resistor (#4738)
* Add variable %timestamp% to rules (#4749)
This PR adds a new variable %timestamp% to be used in a rule to allow the user to include the Time Stamp as Tasmota has for Status, Sensors, etc, for example:
Command:
publish stat/topic/sensor {"Time":"%timestamp%","mysensor":"%var1%"}
Output:
{"Time":"2018-12-27T12:52:57","mysensor":"1"}
(https://github.com/arendst/Sonoff-Tasmota/issues/4734)
Add define USE_MQTT_TLS_CA_CERT for checking MQTT TLS against root ca using Let's Encrypt cert from sonoff_letsencrypt.h - not supported with core 2.3.0 (#4703)
6.4.0.3 20181222
* Change Hass discovery to short MQTT messages as used by Hass 0.81 and up (#4711)
* Change FallbackTopic detection (#4706)
* Add define WIFI_SOFT_AP_CHANNEL in my_user_config.h to set Soft Access Point Channel number between 1 and 13 as used by Wifi Manager web GUI (#4673)
* Fix Alexa "this value is outside the range of the device". Needs power cycle and Alexa deletion/discovery cycle. (#3159, #4712)
