Ping available I2C address

[rpartzsch]

Pings all I2C address and checks for an acknowledged bit.
This is useful to check which I2C devices are connected and respond to basic pings.

[codecov]

Codecov Report

❌ Patch coverage is 8.33333% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 24.82%. Comparing base (71cc596) to head (ead6d8e).
⚠️ Report is 59 commits behind head on master.

Files with missing lines	Patch %	Lines
basil/HL/i2c.py	8.33%	11 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #282       +/-   ##
===========================================
+ Coverage   11.36%   24.82%   +13.46%     
===========================================
  Files          90       91        +1     
  Lines        6239     6300       +61     
===========================================
+ Hits          709     1564      +855     
+ Misses       5530     4736      -794     

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[cbespin]

Very useful, thanks!