add log() function to the built-in CQ-editor console

[jdegenstein]

This is a small commit to add the ability to send output from the CQ-editor console to the built-in Log Viewer:

I have it set currently to INFO level, which I think is appropriate since it is user-initiated anyway.

[codecov[bot]]

Codecov Report

Merging #360 (5aea3ed) into master (774c3c6) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #360   +/-   ##
=======================================
  Coverage   88.66%   88.67%           
=======================================
  Files          19       19           
  Lines        1500     1501    +1     
  Branches      205      205           
=======================================
+ Hits         1330     1331    +1     
  Misses        137      137           
  Partials       33       33           

Impacted Files	Coverage Δ
cq_editor/main_window.py	93.58% <100.00%> (+0.04%)	:arrow_up:

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[adam-urbanczyk]

LGTM, thanks @jdegenstein