* sensor: add DHT_CHIP_SI7021 references

* sensor: update DHT_TYPE definitions, use enum

* changelog

Operating specifications / Communication and signal

"Data-bus's free status is high voltage level. When communication
between MCU and DHT22 begin, program of MCU will transform data-bus's
voltage level from high to low level and this process must beyond at least
**1ms** to ensure DHT22 could detect MCU's signal, then MCU will wait 20-40us for
DHT22's response."

* Added T6613

* Added T6613

* Added T6613

* Added T6613

* Added T6613

* Added T6613

* Added T6613

* Added T6613

* Added T6613

* Updated copyright string

* Buffer from 6 bytes to 8 bytes

Current gcc-4 does not mark this as warning, but gcc-9 notices the 3 char size requirement. Buffer should be 8

* Use 5000ppm max

* Add Shelly 2.5

* Add ADE7953 sensor support

* Fix compilation

* Use only one instance

* WIP: Not working, I got StoreProhibited exception

* Fix exception

* Fix merge issues

* Apply request review changes

* declare struct before using it

* uninterruptible delay

* try optimized reg_size

* fix types

* Remove gpio 0 input in analog sensor

* Add energy to ADE7953, it is not finished yet

* Add new method to save energy with index

* Finish energy for ADE7953

Thanks to @tonilopezmr 
1c3d68af34

* Core 2.6.0+ fixes

* fix env -> config, run travis04 job

* don't duplicate free heap in frag data, use single stats struct

* fix dtostrf warnings, bump buffer sizes

* ...and even less words for fragmentation stat

* enable multiple Digital, Events & PulseMeter

* delete SPI dependency

* back to only one PulseMeter

* deprecared pins

- cache ms<->clockcycles conversions
- move callback invocation outside of ISR handler
- remember last event value

- dynamic number and address setting
- do not return i2c-specific error for wrong values

* Add reactive power calculation and bring output to in line with HLW8012 sensor based units

* Update CSE7766Sensor.h

* Fix energy ratio input for pulse meter sensor

* checkout origin/dev -- webui files

* Testing branch

* Added ability (by define) to scale analog sensor, also with number of decimals (it was formerly zero)
Useful when running on batteries to check the battery voltage just 
adding the appropriate resistor

* Reverting DHTSensor.h file

* Trying again to revert DHTSensor.h

* Using macro DEBUG_MSG

* fix method types

* Testing branch

* Added ability (by define) to scale analog sensor, also with number of decimals (it was formerly zero)
Useful when running on batteries to check the battery voltage just 
adding the appropriate resistor

* Reverting DHTSensor.h file

* Trying again to revert DHTSensor.h

* Using macro DEBUG_MSG

* fix method types