Add mypy and more flake checks

[mdeweerd]

No description provided.

[puddly]

Thank you!

I've submitted a PR to your fork (mdeweerd#1) that fixes the remaining issues preventing this from being merged.

[codecov-commenter]

Codecov Report

Merging #138 (fbc9fe8) into dev (515f4a1) will decrease coverage by 0.07%.
The diff coverage is 94.11%.

@@            Coverage Diff             @@
##              dev     #138      +/-   ##
==========================================
- Coverage   98.66%   98.59%   -0.08%     
==========================================
  Files          44       44              
  Lines        3907     3918      +11     
==========================================
+ Hits         3855     3863       +8     
- Misses         52       55       +3     

Impacted Files	Coverage Δ
zigpy_znp/api.py	96.81% <84.21%> (-0.74%)	⬇️
zigpy_znp/tools/common.py	100.00% <100.00%> (ø)
zigpy_znp/types/basic.py	100.00% <100.00%> (ø)
zigpy_znp/types/commands.py	100.00% <100.00%> (ø)
zigpy_znp/types/cstruct.py	100.00% <100.00%> (ø)
zigpy_znp/types/named.py	100.00% <100.00%> (ø)
zigpy_znp/utils.py	100.00% <100.00%> (ø)
zigpy_znp/zigbee/application.py	95.85% <100.00%> (ø)
zigpy_znp/znp/security.py	95.18% <100.00%> (ø)

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