Use a Logger instead of print()

[gwynne]

Fixes #125

Also does some miscellaneous long-overdue cleanup.

[codecov-commenter]

Codecov Report

Merging #126 (3cabeb0) into main (611bc45) will increase coverage by 0.34%.
Report is 2 commits behind head on main.
The diff coverage is 25.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
+ Coverage   83.27%   83.62%   +0.34%     
==========================================
  Files           4        4              
  Lines         287      232      -55     
==========================================
- Hits          239      194      -45     
+ Misses         48       38      -10     

Files Changed	Coverage Δ
Sources/RoutingKit/AnyRouter.swift	0.00% <ø> (ø)
Sources/RoutingKit/TrieRouter.swift	93.29% <16.66%> (-2.59%)	⬇️
Sources/RoutingKit/Parameters.swift	75.00% <50.00%> (ø)

... and 1 file with indirect coverage changes

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[0xTim]

Couple of queries

[MahdiBM]

Some notes 🙂

[penny-for-vapor]

These changes are now available in 4.8.0