Overhaul Linking Methodology

[junder873]

The older linking methodology was slow and rather inefficient. This new set makes better use of multiple dispatch and has a simpler, more consistent user interface. It also provides more robust documentation.

[codecov-commenter]

Codecov Report

Merging #11 (0210d5b) into master (4087aea) will increase coverage by 1.63%.
The diff coverage is 73.48%.

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@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   71.82%   73.46%   +1.63%     
==========================================
  Files          11       11              
  Lines         749      946     +197     
==========================================
+ Hits          538      695     +157     
- Misses        211      251      +40     

Impacted Files	Coverage Δ
src/links/downloadLinks.jl	0.00% <0.00%> (ø)
src/links/specialCases.jl	33.33% <33.33%> (ø)
src/links/identifierTypes.jl	60.34% <60.34%> (ø)
src/links/linkPairs.jl	67.56% <67.56%> (ø)
src/links/creatingLinks.jl	88.48% <88.48%> (ø)
src/links/linkMethods.jl	89.81% <89.81%> (ø)
src/utils.jl	76.31% <92.30%> (+1.80%)	⬆️

... and 3 files with indirect coverage changes

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