Clear command

[0xfedcafe]

Added clear command and test as suggested in issue #1810

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.70%. Comparing base (df562fe) to head (06ac7bc).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1836   +/-   ##
=======================================
  Coverage   95.70%   95.70%           
=======================================
  Files         125      125           
  Lines        9821     9832   +11     
=======================================
+ Hits         9399     9410   +11     
  Misses        422      422           

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[mwestphal]

thanks for the contribution! Some changes needed though :)

Also, you need to update the doc in doc/user/COMMANDS.md

[Meakk]

It looks great! Thanks

[mwestphal]

Thanks for your contribution @0xfedcafe !!!