Use __ as delimiter for embedded statuses

[rytilahti]

Leaves ":" free for other uses,
converts to use __getattr__ instead of __getattribute__ to avoid checking on every attribute access.

[codecov-commenter]

Codecov Report

Merging #1573 (4045404) into master (34d3f0e) will decrease coverage by 0.02%.
The diff coverage is 32.14%.

@@            Coverage Diff             @@
##           master    #1573      +/-   ##
==========================================
- Coverage   81.06%   81.03%   -0.03%     
==========================================
  Files         155      155              
  Lines       15071    15079       +8     
  Branches     3250     3250              
==========================================
+ Hits        12217    12219       +2     
- Misses       2610     2615       +5     
- Partials      244      245       +1     

Impacted Files	Coverage Δ
miio/devtools/pcapparser.py	0.00% <0.00%> (ø)
miio/click_common.py	53.62% <45.45%> (+0.94%)	⬆️
miio/devicestatus.py	90.41% <50.00%> (-2.74%)	⬇️
miio/miioprotocol.py	33.56% <50.00%> (+0.45%)	⬆️

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[rytilahti]

Ping @starkillerOG – looks like the previous implementation used wrong dunder method for accessing the custom attributes, this should fix the issues you had when you tried to use __ earlier in names in your PR.

[starkillerOG]

Thanks for looking into this, I will test this as soon as possible

[starkillerOG]

@rytilahti I just tested it and it works as advertised, Thanks!