new 'gatecost' heuristic implemented

[AlexPloier]

for tcad journal final version, so the code is up-to-date w. the paper

[burgholzer]

Please resolve the conflicts reported by git and check that CI passes on your changes. Otherwise, I can't give this a proper review.

[codecov[bot]]

Codecov Report

Merging #105 (7f83797) into main (357fb74) will increase coverage by 0.1%. The diff coverage is 92.7%.

@@           Coverage Diff           @@
##            main    #105     +/-   ##
=======================================
+ Coverage   87.4%   87.6%   +0.1%     
=======================================
  Files         20      20             
  Lines       2036    2083     +47     
  Branches     358     367      +9     
=======================================
+ Hits        1781    1826     +45     
- Misses       255     257      +2     

Impacted Files	Coverage Δ
src/CircuitSimulator.cpp	94.8% <ø> (ø)
src/PathSimulator.cpp	89.0% <91.8%> (+0.4%)	:arrow_up:
include/PathSimulator.hpp	87.9% <94.4%> (+1.6%)	:arrow_up:
src/Simulator.cpp	96.4% <0.0%> (+0.4%)	:arrow_up:

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[burgholzer]

Please consider extending the C++ tests to cover your changes and assert that everything works properly.