Remove needless traits and structs

[dr-orlovsky]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 25 lines in your changes are missing coverage. Please review.

Project coverage is 30.8%. Comparing base (895e7ad) to head (e689fe7).

Files	Patch %	Lines
src/isa/exec.rs	0.0%	20 Missing ⚠️
src/vm.rs	0.0%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #114     +/-   ##
========================================
- Coverage    30.9%   30.8%   -0.2%     
========================================
  Files          23      20      -3     
  Lines        6500    6347    -153     
========================================
- Hits         2011    1952     -59     
+ Misses       4489    4395     -94     

Flag	Coverage Δ
rust	30.8% <0.0%> (-0.2%)	⬇️

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