Add severity level filter to log messages

[jmthomas]

closes #138

[codecov]

Codecov Report

Merging #149 (22a27ff) into master (5f87264) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #149   +/-   ##
=======================================
  Coverage   73.71%   73.71%           
=======================================
  Files         426      426           
  Lines       25540    25540           
  Branches      555      555           
=======================================
  Hits        18828    18828           
  Misses       6629     6629           
  Partials       83       83           

Flag	Coverage Δ
frontend	76.16% <ø> (ø)
ruby-backend	77.96% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...smonitor/src/tools/LimitsMonitor/LimitsControl.vue	81.48% <0.00%> (-0.75%)	⬇️
...enc3-tool-calendar/src/tools/Calendar/Calendar.vue	71.72% <0.00%> (+0.68%)	⬆️

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[jmthomas]