Add water_level and water_tank_detached property for humidifiers, deprecate depth

[bieniu]

This PR:

• adds water_level property for AirHumidifier (value is calculated from depth)
• adds water_tank_detached for AirHumidifier (value is calculated from depth)
• fixes water_level calculation for AirHumidifierMiot
• adds water_tank_detached for AirHumidifierMiot (value is calculated from water_level)

[codecov-commenter]

Codecov Report

Merging #1089 (d31b8e8) into master (b9393f3) will increase coverage by 0.02%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##           master    #1089      +/-   ##
==========================================
+ Coverage   75.43%   75.45%   +0.02%     
==========================================
  Files          74       74              
  Lines        8372     8386      +14     
  Branches      743      745       +2     
==========================================
+ Hits         6315     6328      +13     
- Misses       1875     1876       +1     
  Partials      182      182              

Impacted Files	Coverage Δ
miio/airhumidifier_miot.py	82.89% <71.42%> (-0.78%)	⬇️
miio/airhumidifier.py	87.56% <100.00%> (+1.62%)	⬆️
miio/deviceinfo.py	80.64% <0.00%> (-3.23%)	⬇️

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[bieniu]

@rytilahti Are you planning to release a new version? The migration of humidifiers from the fan platform to the humidifier in HA was merged and now we need water_level property 😁

[rytilahti]

Yes, I'll prepare a new release when I return from the holidays (i.e., there should be a new release available in a couple of weeks), if @syssi doesn't beat me with that. Sorry for the delay :/

[bieniu]

Sorry for the delay :/

No problem, enjoy the holidays.