add client settings for report font

[kuronekochomusuke]

1. add client settings for report font

[codecov]

Codecov Report

Attention: Patch coverage is 4.34783% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 29.11%. Comparing base (b29a07c) to head (a879926).
Report is 1 commits behind head on master.

Files	Patch %	Lines
.../megamek/client/ui/swing/CommonSettingsDialog.java	0.00%	10 Missing ⚠️
megamek/src/megamek/common/Report.java	0.00%	7 Missing ⚠️
...ek/src/megamek/client/ui/swing/GUIPreferences.java	25.00%	3 Missing ⚠️
...src/megamek/client/ui/swing/MiniReportDisplay.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5321      +/-   ##
============================================
+ Coverage     29.09%   29.11%   +0.01%     
- Complexity    13458    13473      +15     
============================================
  Files          2389     2389              
  Lines        260723   260740      +17     
  Branches      46751    46752       +1     
============================================
+ Hits          75863    75904      +41     
+ Misses       181186   181171      -15     
+ Partials       3674     3665       -9     

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