v1.2.25: Bump version and add docs

Load word data from Youtube VTTs

* subed/subed-word-data.el (subed-word-data--extract-words-from-youtube-vtt): New.
(subed-word-data--load): Update documentation.
(subed-word-data-load-from-file): Load from
Youtube VTTs as well.
(subed-word-data-load-from-string): Load from
Youtube VTTs as well.
(subed-word-data-load-maybe): Check if data was loaded.

Add menu. Also, subed-kill-subtitle: Actually kill subtitle

* subed/subed-menu.el: New.
* subed/subed-common.el (kill-subtitle): Actually
kill subtitle instead of just deleting it, in case
someone wanted to yank it somewhere.

v1.2.22: add documentation

subed-word-data bugfix

subed-word-data: bugfix

v1.2.19: increase version based on subed-word-data enhancement

v1.2.18: VTT: Ignore timestamp-like text at the start of subtitle cues

* subed/subed-vtt.el (subed--validate-format):
Navigate by subtitle ID so that we skip
timestamp-like text at the start of cues. Related
to #80 .
* tests/test-subed-vtt.el ("subed-vtt"): Add test.

v1.2.17: Merge without including the current subtitle

* subed/subed-common.el (merge-region): Merge
without including the current subtitle if the
point is at the beginning.
(subed-create-file): Update docstring.
(subtitle-start-pos):
* tests/test-subed-tsv.el ("subed-tsv"): Add test
for merging and subtitle-start-pos.
* tests/test-subed-srt.el ("subed-srt"): Add test
for subtitle-start-pos.
* tests/test-subed-vtt.el ("subed-vtt"): Add test
for subtitle-start-pos.

1.2.16: Changed behavior: Merging now combines lines

I kept running into this with short subtitles. If
you prefer it the other way (keeping line breaks),
let me know and we can make it an option.

* subed/subed-srt.el (subed--merge-with-next): Add
a space instead of a newline.
* subed/subed-vtt.el (subed--merge-with-next): Add
a space instead of a newline.
* tests/test-subed-common.el ("subed-common"):
Update merge test.
* tests/test-subed-srt.el ("subed-srt"): Update
merge test.
* tests/test-subed-vtt.el ("subed-vtt"): Update
merge test.