chore: relinted codebase

[fredbi]

• Exported API reduced to what go-swagger is calling: all other exported symbols are now unexported

• carried out all simple relinting actions

• modernized statements (use iterators, ...)

• used nolint where appropriate for now, pending future deeper refactoring actions

• refactored deeply nested structures and complex functions (including test code)

• refactored code duplication

• relaxed a few linting constraints (complexity, maintainability index)

No change in semantics, no change in test assertions

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

❌ Patch coverage is 67.03854% with 325 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.63%. Comparing base (e9cab73) to head (01925e5).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
schema.go	54.60%	106 Missing and 42 partials ⚠️
parser.go	80.89%	30 Missing and 17 partials ⚠️
parameters.go	59.09%	26 Missing and 10 partials ⚠️
responses.go	52.54%	18 Missing and 10 partials ⚠️
application.go	71.76%	15 Missing and 9 partials ⚠️
spec.go	0.00%	15 Missing and 2 partials ⚠️
taggers.go	82.95%	12 Missing and 3 partials ⚠️
assertions.go	0.00%	3 Missing ⚠️
operations.go	87.50%	3 Missing ⚠️
meta.go	0.00%	2 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
- Coverage   71.80%   71.63%   -0.17%     
==========================================
  Files          13       14       +1     
  Lines        3862     3794      -68     
==========================================
- Hits         2773     2718      -55     
+ Misses        785      761      -24     
- Partials      304      315      +11     

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