more software signatures

[jstucke]

• added some software signatures (mbed TLS, file, opkg)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.90%. Comparing base (aa041a9) to head (7696794).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1301      +/-   ##
==========================================
- Coverage   91.94%   91.90%   -0.04%     
==========================================
  Files         377      376       -1     
  Lines       22295    21038    -1257     
==========================================
- Hits        20499    19336    -1163     
+ Misses       1796     1702      -94     

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[maringuu]

Can you document somewhere (commit message/code comments), why these signatures are correct?
I think it is important to not only have signatures, but also be able to verify why they are correct.
The most preferable proof would we permalinks to source code, but I'm happy with anything that allows me to understand why the signatures are as they are.