meta.ini: revert to upstream CamelCase, canonicalize on read

Restore upstream MO2's exact key cases (gameName, installationFile,
nexusDescription, etc.) in readMeta/saveMeta/doInstall/createMod —
matches mod-shipped meta.ini cases, so on Linux Qt6's case-sensitive
QSettings IniFormat, setValue updates in place without producing a
duplicate key.

normalizeMetaIniCase() repurposed: instead of folding everything to
lowercase (which mismatched the upstream-style setValue calls and
caused the very dupes it was trying to fix), it now canonicalizes
known per-mod meta.ini keys to their upstream CamelCase, deduping
case-insensitive collisions per section. Cleans up dirty files
written during the 5d1fb29 -> 1f19892 window so they collapse to a
single canonical key per setting on first read.

Tests updated to assert canonical-CamelCase output.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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