https://github.com/grigorig/ucdn/issues/23

style fix and add return statement

Fixes https://bugs.chromium.org/p/chromium/issues/detail?id=960331

As 503748d8 fix

Fixed at 6977a95f

Also move the implementation of some methods from the .cc to the .hh

Add unit test and integration test

Fixes https://github.com/harfbuzz/harfbuzz/issues/1592

Fixes https://github.com/harfbuzz/harfbuzz/issues/1541

This allows partial-instantiating custom Null object for template Lookup<T>.
Before, this had to be handcoded per instantiation.  Apparently I missed
adding one for AAT::ankr.lookupTable, so it was getting the wrong (generic)
null for Lookup object, which is wrong and unsafe.

Fixes https://bugs.chromium.org/p/chromium/issues/detail?id=944346

* add check to FDArray::serialize

* add test files

* fix off by one

Fixes fvar table sanitization where there are no named instance
by allowing zero length ranges starting from Null() address.

Fixes #1607

so in sync with fonttools behavior

and CFF retain-gids fixes

along with api tests & expected results

[subset] Update the subset fuzzer to determine which options to use based on data in the fuzzing test case.
Add support for toggling retain_gids.