readtextgrid 0.2.0

@JoFrhwld

read_textgrid() now manually parses textgrids and can handle short-format
textgrids. (#4, #16, initial parser by @JoFrhwld). Part of the parsing is done
in C++ so the new manual parser is faster than the legacy version.
The new parser is documented in a non-package supplemental vignette called
"Textgrid specification" on the package website.
Original package functions are available in legacy_read_textgrid().
legacy_read_textgrid() un-escapes A ""quote"" word to A "quoted" word.
legacy_read_textgrid() can handle interval text with line breaks in them.
New function pivot_textgrid_tiers() to pivot out nested textgrid
intervals into a wide dataframe. For example, if a forced aligner has a
words and phones tier, we can pivot the words and phones
intervals into a dataframe with one row per phones intervals and with
columns words, words_xmin, words_xmax, phones, phones_xmin,
phones_xmax, etc. (#10, request of @stefanocoretta)
Testing suite includes a short-format textgrid, a short-format textgrid
with inline comments, and a textgrid with escaped " characters. (@JoFrhwld)
Testing suit includes an adversarial textgrid to challenge parsing.
Support ELAN-generated textgrids. (#11, @djvill)
Raised required R version to 4.3.0. (April 2023)

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