Throw out-of-memory errors instead of segfaulting.

Merge branch 'master' of git.adrian.geek.nz:/srv/git/harfbuzz-pure

Documentation-compilation fixes, release v1!

Fix use of utf8-light dependency, dropping it.

Fix tag encoding & decoding (remembered hex digits are nybbles not bytes)

Document Buffer API.

Correctly decode Harfbuzz output structs.

I didn't consider the presence of private-fields before!

Fix segfaults & include test assets (major refactor).

Fix segfault upon too much HarfBuzz concurrency.

Fix reentrancy complaints from GHC, attempt to fix segfault.

Add documentation & corrected type signatures.

Add, test, & fix shaping function.

Fix build linking errors (mostly by upgrading GHC).

I'm now running on this on elementary OS Jolnir.

Try wrapping HarfBuzz C++ functions in C functions for calling convention/linking issues.

Committing so I can try building on a newer OS.

Draft language bindings to font/face APIs.

Expose util functions on scripts & buffers.

Correction: buffer's codepoints are all Chars.

Reimplement parts of Harfbuzz where that's easier than writing a binding.

Removed a note where that turned out not to be the case.

Integrate guessing chars, document properties, expose default property values.

Implement conversion from functional Buffers to imperative Buffers.