Shopfloor: add log severity and improve display

[simahawk]

ref: 1638

[codecov-io]

Codecov Report

Merging #95 into 13.0-shopfloor will decrease coverage by 0.60%.
The diff coverage is 25.00%.

@@                Coverage Diff                 @@
##           13.0-shopfloor      #95      +/-   ##
==================================================
- Coverage           90.56%   89.95%   -0.61%     
==================================================
  Files                  92       92              
  Lines                5153     5199      +46     
==================================================
+ Hits                 4667     4677      +10     
- Misses                486      522      +36     

Impacted Files	Coverage Δ
shopfloor/services/service.py	66.10% <22.22%> (-4.03%)	⬇️
shopfloor/models/shopfloor_log.py	40.29% <26.47%> (-15.59%)	⬇️

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