epistle_to_third: epistle_to_third()
In seanrsilver/novnet: Novel Networks Project: Tools and Utilities

This function is used by txt_to_df() to transform first-person pronouns in texts with first-person narrative voice.

1	epistle_to_third(input.text, author.name, addressee.name)

`input.text`	A character vector of a single epistle, with punctuation left in. Each element may be a line, sentence, paragraph, etc...
`author.name`	A character string of the alternate name token to signal the first-person author of an epistle. This function transforms non-dialogic 1st-person pronouns into this variable's value. It must therefore match a unique alternate name on the associated Char.csv file.
`addressee.name`	A character string of the alternate name token to signal the second-person recipient of an epistle. This function transforms 2nd-person pronouns into this variable's value. It must therefore match a unique alternate name on the associated Char.csv file.