Sbat code generation improves

[freddy77]

This PR contains improves to the code to generate SBAT files from SbatLevel_Variable.txt.
Mostly are style changes, some others more strict checks in order to avoid some possible errors.
Specific commits contain more explanation.

• Make some functions static
• Constify some variables
• Fix readfile error check
• Factor out and reuse function to clear revocation list
• Use tabs for indentation
• Use bool for epochfound
• Use unsigned for date field
• Reduce indentation
• Check file read error
• Restrict some variable scope
• Make errors more verbose
• Add more explicit check on revocation list format
• Make sure revocation string is always terminated
• Handle not newline terminated last line correctly
• Better checks for revocation lines
• Minor output format style changes
• Don't ignore first program argument
• Declare parameters for writefile function

[freddy77]

How to add some reviewers?

[freddy77]

ping

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.82%. Comparing base (96afee7) to head (199cd6f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #793   +/-   ##
=======================================
  Coverage   58.82%   58.82%           
=======================================
  Files          24       24           
  Lines        4223     4223           
  Branches      654      654           
=======================================
  Hits         2484     2484           
  Misses       1468     1468           
  Partials      271      271           

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