remove use of ComponentPaths as arguments in any user-facing functions

[corakingdon]

#662

[codecov]

Codecov Report

Merging #718 into master will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #718      +/-   ##
==========================================
+ Coverage   79.81%   79.95%   +0.13%     
==========================================
  Files          38       38              
  Lines        2888     2883       -5     
==========================================
  Hits         2305     2305              
+ Misses        583      578       -5     

Flag	Coverage Δ
#unittests	79.95% <100.00%> (+0.13%)	⬆️

Impacted Files	Coverage Δ
src/core/defs.jl	83.58% <ø> (+0.50%)	⬆️
src/core/model.jl	86.04% <ø> (ø)
src/core/connections.jl	87.32% <100.00%> (+0.28%)	⬆️
src/core/references.jl	66.66% <100.00%> (+13.33%)	⬆️

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