Whitelist comments in all JSON files

Currently many files contain comments but are being matched as JSON incorrectly.
To fix this, let's associate `*.json` with JSONC and fix the false positive error highlights.

SNDST00M: M.U.N.I.N committed 4y ago

9e0857e916632b306d047ad7324980bfa5b48fea

Parent: 847a6d8

Committed by GitHub <noreply@github.com> on 7/23/2021, 1:08:39 AM