stringtables: add trailing newline, trim for comparisions

[BrettMayson]

Fixes #825

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 69.1%. Comparing base (ab357f8) to head (e2bd90b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
libs/stringtable/src/lib.rs	0.0%	6 Missing ⚠️
libs/stringtable/src/analyze/lints/01_sorted.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
libs/stringtable/src/analyze/lints/01_sorted.rs	27.4% <0.0%> (ø)
libs/stringtable/src/lib.rs	22.5% <0.0%> (-3.4%)	⬇️