General fixes:
=============
-- Warn at compile time (and runtime with HB_DEBUG?) if no Unicode funcs
- found / set.
+- Warn at compile time (and runtime with HB_DEBUG?) if no Unicode / font
+ funcs found / set.
- In hb_shape(), assert if direction is INVALID.
- Synthetic GDEF.
+- Add Pango backend?
+
+- Add ICUlayout backend?
+
+- Add ICUlayout API?
+
+- Add Old HarfBuzz backend?
+
+- Add Old HarfBuzz API?
+
API issues to fix before 1.0:
============================
+- Add default font_funcs / Unicode funcs API and to utils.
+
+- Add init_func to font_funcs. Adjust ft.
+
- Add pkg-config files for glue codes (harfbuzz-glib, etc)
- Figure out how many .so objects, how to link, etc