Reorganize all integrations to vendor-specific dirs

[rytilahti]

This will move all integrations to their own separate directories named after the vendor name (which is mostly the same as in the model string).

Example structure:

├── zhimi
│   ├── airpurifier
│   │   ├── airfilter_util.py
│   │   ├── airfresh.py
│   │   ├── airpurifier_miot.py
│   │   ├── airpurifier.py
│   │   ├── __init__.py
│   │   └── tests
│   │       ├── __init__.py
│   │       ├── test_airfilter_util.py
│   │       ├── test_airfresh.py
│   │       ├── test_airpurifier_miot.py
│   │       └── test_airpurifier.py
│   ├── fan
│   │   ├── fan.py
│   │   ├── __init__.py
│   │   ├── test_fan.py
│   │   ├── test_zhimi_miot.py
│   │   ├── zhimi_fan.yaml
│   │   └── zhimi_miot.py
│   ├── heater
│   │   ├── heater_miot.py
│   │   ├── heater.py
│   │   ├── __init__.py
│   │   ├── test_heater_miot.py
│   │   └── test_heater.py
│   ├── humidifier
│   │   ├── airhumidifier_miot.py
│   │   ├── airhumidifier.py
│   │   ├── __init__.py
│   │   └── tests
│   │       ├── __init__.py
│   │       ├── test_airhumidifier_miot.py
│   │       └── test_airhumidifier.py
│   └── __init__.py

Fixes #1115

[codecov-commenter]

Codecov Report

Merging #1697 (033888c) into master (d6b5fe8) will increase coverage by 1.86%.
The diff coverage is 99.05%.

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@@            Coverage Diff             @@
##           master    #1697      +/-   ##
==========================================
+ Coverage   79.60%   81.46%   +1.86%     
==========================================
  Files         161      197      +36     
  Lines       16149    17910    +1761     
  Branches     3641     3843     +202     
==========================================
+ Hits        12855    14591    +1736     
- Misses       3015     3031      +16     
- Partials      279      288       +9     

Impacted Files	Coverage Δ
miio/integrations/airdog/airpurifier/__init__.py	100.00% <ø> (ø)
...egrations/airdog/airpurifier/airpurifier_airdog.py	93.82% <ø> (ø)
...irdog/airpurifier/tests/test_airpurifier_airdog.py	100.00% <ø> (ø)
miio/integrations/deerma/humidifier/__init__.py	100.00% <ø> (ø)
...tegrations/deerma/humidifier/airhumidifier_jsqs.py	91.95% <ø> (ø)
...egrations/deerma/humidifier/airhumidifier_mjjsq.py	93.33% <ø> (ø)
...deerma/humidifier/tests/test_airhumidifier_jsqs.py	98.73% <ø> (ø)
...eerma/humidifier/tests/test_airhumidifier_mjjsq.py	100.00% <ø> (ø)
miio/integrations/dmaker/airfresh/__init__.py	100.00% <ø> (ø)
...iio/integrations/dmaker/airfresh/airfresh_t2017.py	96.10% <ø> (ø)
... and 169 more

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