Splits pronunciation into two fields

[kylebgorman]

The two fields are now called:

• raw_pron
• var_pron

Also corrects some unrelated errors, naming conventions, etc. and streamlines the internals.

The first line now looks like:

verse {
  verse_number: 1
  text: "Arma virumque canō, Trojae quī prīmus ab ōris"
  norm: "arma virumque canō trojae quī prīmus ab ōris"
  raw_pron: "arma wirũːkwe kanoː trojjaj kwiː priːmus ab oːris"
  var_pron: "arma wirũːkwe kanoː trojjaj kwiː priːmu sa boːris"
}

[kylebgorman]

If accepted I'll reopen and submit #66.