99f5160e1c
Adds optional `hl.winhl` config that controls the picker windows' `winhighlight`. Accepts either a single string applied to all picker windows, or a table with optional `prompt`, `list`, `preview`, and `file_info` keys. Missing keys fall back to the default composed from `hl.normal`, `hl.border`, and `hl.title`. Refs #140 Co-authored-by: Dmitriy Kovalenko <dmtr.kovalenko@outlook.com>