Account support

[coderofstuff]

Allow generating and signing with accounts other than the default 0'

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (2e5b288) 80.51% compared to head (a12d186) 80.56%.

Files	Patch %	Lines
src/transaction/deserialize.c	60.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
+ Coverage   80.51%   80.56%   +0.04%     
==========================================
  Files           7        7              
  Lines         385      391       +6     
==========================================
+ Hits          310      315       +5     
- Misses         75       76       +1     

Flag	Coverage Δ
unittests	80.56% <71.42%> (+0.04%)	⬆️

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