4.5.0

CHANGES:

• Move all the PPXs to ppxlib
  (#271, Initial code by Sonja @pitag-ha Heinze)

• Add the translate attribute
  (#281 by Javier @jchavarri Chávarri)

• Update allowed inputmodes
  (#279 by Joel @joelburget Burget)

• Add the picture element
  (#263 by Stéphane @slegrand45 Legrand)