new: Added configuration options to force showing time and level fields

[pamburus]

Also changed the default behavior to show them only if present.

Config file changes:

fields:
  predefined:
    time:
      show: auto
    level:
      show: auto

Valid values: auto, always.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.61%. Comparing base (1399d74) to head (3b7634a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #242      +/-   ##
==========================================
+ Coverage   53.86%   54.61%   +0.75%     
==========================================
  Files          38       38              
  Lines        9412     9473      +61     
==========================================
+ Hits         5070     5174     +104     
+ Misses       4342     4299      -43     

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