Remove hacked Doulos from project -- no longer needed

[K8TIY]

Doulos SIL 5 includes Latin Extended-D since 2015, so reliance on the two "hacked" fonts for generating PDF image maps with U+A7F8 Faucalized are no longer needed as long as the generating machine has the updated font. Also, check the FIXME at ImageMapGen/AppController.m:330

[schmidhauser]

Doulos includes neither ꞵ (U+A7B5) nor ꭓ (U+AB53) – for those who prefer to keep the IPA symbols separate from the ordinary Greek letters β and χ. Noto Sans and Noto Serif, for instance, include both characters (https://www.google.com/get/noto/).

[K8TIY]

Counterexample: https://www.internationalphoneticassociation.org/sites/default/files/phonsymbol.pdf
... which is likely an ancient document. Greek and LE-D blocks seem equally legit. This might qualify as a user preference.

[K8TIY]

It should be fine to keep Greek for the purposes of PDF map generation, that is not user-facing. For the Palette itself, we need to look at adding a Latin Extended-D option. (May be a separate ticket.)

[K8TIY]

The combining palatal and retroflex hook hacks are still needed, but the faucalized superscript and combining velarized/pharyngealized symbols have been added as of Doulos 5.

[K8TIY]

Need to decide whether to spin off a ticket for ꞵ U+A7B5 and ꭓ U+AB53 vs Greek blocks as a user preference.