caption.js 2.2.0: sentence and paragraph rules as options

[maboa]

caption.js closes a caption at every word ending in a full stop. Two consequences, both measured in the editor:

• An abbreviation cuts a sentence in two: "We spoke to Dr. Smith about it." generates We spoke to Dr. · Smith about it.
• A run of short sentences comes out one to a caption: "Yes. No. Maybe. I see." generates four cues, which in fast dialogue flash past, since the minimum-duration safeguard can only extend a cue as far as the next one's start.

init() takes an optional eighth argument of rules. With no options the output is unchanged, and a test pins that.

option	effect
detectAbbreviations	A dotted abbreviation (e.g., U.S., p.m., Ph.D.) ends a sentence only when the next word starts with a capital, so "We left at 5 p.m. Then it rained." still breaks. A lone initial (J.) never ends one; I. is a word and does.
abbreviations	Words that never end a sentence — titles such as Dr. or Prof., which no rule can tell from a sentence end because a capital follows them too. An array or Set; case and the trailing full stop are ignored. Language-specific, so the caller supplies them and the library ships no list.
joinSentences	A short sentence shares the caption before it when the whole sentence fits there: on the same line, or as the second line of a one-line caption. A sentence is never split in order to fill a caption, and nothing is joined across a speaker label or a pause longer than maxJoinGap.
maxJoinGap	Seconds of silence that still allow a join. Default 1.
paragraphBreaks	A new paragraph always starts a new caption — also where a paragraph ended without punctuation, which today runs straight on.

?, !, 。, ؟ and an ellipsis behave as before. Joining measures the pause from where the previous caption's speech really ends, not from a stop time the timing safeguards may later extend.

caption.d.ts gains CaptionOptions, and the README documents the argument. 15 new tests; the caption suite is 28/28 and the whole suite 89/89.

The version header moves to 2.2.0. changelog.md and the package version are left for the release commit.

Refs hyperaudio/hyperaudio-lite-editor#661, hyperaudio/hyperaudio-lite-editor#662