Build vanilla PKGs in SR

[ThanatosGit]

This is the code which can parse and rebuild all pkg files except 11 files. The only problem is the end of the file.
Always end with 0 padding at the end of the file except for MSCU MTXT CUT which adds padding to align to 4 bytes.

• removing MSCU from special case => more files gonna fail
• removing MTXT from special case => more files gonna fail
• adding MSAT to the special case => more files gonna fail

The wrong_build_sr case in the test is written in a weird way on purpose. It proofes that, of course, the length field is wrong but besides that it's only the ending which is wrong.

Don't know if it should merged 🤷‍♂️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.19%. Comparing base (69ddf9d) to head (1019948).
Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
+ Coverage   74.02%   74.19%   +0.16%     
==========================================
  Files          62       62              
  Lines        3142     3154      +12     
==========================================
+ Hits         2326     2340      +14     
+ Misses        816      814       -2     

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[ThanatosGit]

As I have still no idea how I could ever find out the random padding at the end of the file, I would like to merge that post MSR stable.
Should I clean up anything here?

[dyceron]

Looks good to me. Shame about the pkgs not rebuilding properly, especially bcut, but better for now.