Performance optimizations and refactoring

[yaricom]

• Refactored max activation depth estimation to be more effective
• Implemented lazy genesis of the organism's phenotype to reduce CPU usage during reproduction
• Changed species sorting order implementation to exclude phenotype complexity from consideration
• Changed organisms sorting order to be depended only of the fitness
• Optimized speed of matting loops by avoiding unnecessary runs of inner loops in some cases

[codecov[bot]]

Codecov Report

Merging #59 (f003121) into master (ac60a6c) will increase coverage by 0.87%. The diff coverage is 76.51%.

:exclamation: Current head f003121 differs from pull request most recent head 9cc0a96. Consider uploading reports for the commit 9cc0a96 to get more accurate results

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   67.57%   68.44%   +0.87%     
==========================================
  Files          38       39       +1     
  Lines        4459     4532      +73     
==========================================
+ Hits         3013     3102      +89     
+ Misses       1048     1024      -24     
- Partials      398      406       +8     

Impacted Files	Coverage Δ
experiment/experiment_execute.go	67.69% <ø> (ø)
neat/genetics/common.go	94.11% <ø> (-5.89%)	:arrow_down:
neat/genetics/gene.go	76.92% <ø> (ø)
neat/genetics/genome_compatibility.go	80.43% <ø> (ø)
neat/genetics/genome_writer.go	73.24% <ø> (ø)
neat/genetics/mimo_gene.go	73.07% <ø> (ø)
neat/genetics/population_epoch.go	63.50% <ø> (ø)
neat/genetics/population_io.go	55.93% <ø> (ø)
neat/genetics/species.go	53.04% <0.00%> (+2.22%)	:arrow_up:
neat/network/common.go	100.00% <ø> (ø)
... and 21 more