Add Millfeuille G2P and Fr DiffSinger phonemizer

[imsupposedto]

Add Millfeuille G2P trained by myself Implementation help by tigermeat Ensured G2P is in lyric helper and phonetic assistant

[lottev1991]

Is this still being worked on? I think it would be great to have this phonemizer built-in, due to the popularity of Millefeuille banks.