去掉 HTML 标签、ASS 特效、听障提示、说话人和字幕组水印，修好全大写与乱码。
Run a downloaded subtitle through here first: watermarks, ads, SDH cues and HTML tags, gone in one pass.
13 rules in four groups (9 on by default), watermark and SDH removal, all-caps and mojibake fixes, per-cue change list with individual revert, and the timing is never touched.
Anyone who grabbed an existing subtitle and just wants it usable, and groups batch-cleaning material.