Upgrade lints package, make lints more strict, and fix new lint errors #174
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Description & Motivation
The "lints" package was on an old version, so this PR upgrades it.
The lints were too lenient (many rules disabled), so this PR enables many more.
The new lint checks flagged many issues
Related Issue(s)
Fix #165
A lint check caught #170, so to fix the lint issue the issue was fixed, but no new tests are opened so the issue is left open until it is properly tested.
Testing
Existing tests cover functionality.
Reran
dart doc .
to ensure that documentation fixes are clean.Backwards-compatibility
No, though some new warnings may appear.
Documentation
Yes, lint issues related to documentation were fixed.