Add new tele- rule triggers

[ascillato]

Description:

By adding the rule trigger tele-power1#state for relays (as done in PR #7088 for switches), this PR also unlocks several other triggers for rules, that were accessible before only by the scripting feature.

New set of rule triggers:

• tele-power1#state
• tele-wifi1#ap
• tele-wifi1#ssid
• tele-wifi1#bssid
• tele-wifi1#channel
• tele-wifi1#RSSI
• tele-wifi1#LinkCount
• tele-wifi1#Downtime

Related issue (if applicable): fixes some custom periodics updates for power status as done in PR #7088 for switches. If a Home Automation Software can't use the information of teleperiod and/or status 11 as Tasmota's default, now the user can use a rule, to be triggered at teleperiod time, so as to periodically inform relay's status or wifi status like for example:

rule1 1
rule1 on tele-relay1#state do publish stat/mydevice/relay1 %value% endon

This PR is backwards compatible due there was no trigger for relays or wifi at teleperiod time and it also don't affect the instantaneous trigger power1#state.

At this moment, the Tele message is like:

15:04:57 MQT: tele/living/STATE = {"Time":"2019-12-02T15:04:57","Uptime":"0T00:06:13","UptimeSec":373,"Heap":20,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":1,"POWER1":"OFF","Wifi":{"AP":2,"SSId":"NetWirelessB","BSSId":"D8:5D:4C:C6:84:56","Channel":11,"RSSI":52,"LinkCount":1,"Downtime":"0T00:00:06"}}

and with this PR, it changes to:

15:04:57 MQT: tele/living/STATE = {"Time":"2019-12-02T15:04:57","Uptime":"0T00:06:13","UptimeSec":373,"Heap":20,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":1,"POWER1":{"STATE":"OFF"},"Wifi":{"AP":2,"SSId":"NetWirelessB","BSSId":"D8:5D:4C:C6:84:56","Channel":11,"RSSI":52,"LinkCount":1,"Downtime":"0T00:00:06"}}

Checklist:

• The pull request is done against the latest dev branch
• Only relevant files were touched
• Only one feature/fix was added per PR.
• The code change is tested and works on core 2.6.1
• The code change pass travis tests. Your PR cannot be merged unless tests pass
• I accept the CLA.

[jziolkowski]

This changes STATE message to "POWER1":{"STATE":"ON"},"POWER2":{"STATE":"ON"} breaking HA autodiscovery, TDM and I guess quite a few other things observing STATE message

[ascillato]

Reverting back this change in Tasmota's status message due to it is breaking backwards compatibility with several tools and setups.

See ##7127