This saves each object allocation 72 bytes.  Now object overhead is just
16 bytes (on x86) instead of 88 bytes. Neat.

Fixes https://github.com/harfbuzz/harfbuzz/issues/1023

Right now only Old Italic is marked as such.

Fixes https://github.com/harfbuzz/harfbuzz/issues/1000

Towards making blob more memory-allocation-friendly

We should hang those off somewhere else. For now, the unused ones can go.

To avoid need of CMP0063 which is not available on older CMake versions

X-terminated means don't access this, it's not located correctly.
Z-terminated means this is a C array with no bound checking.

Part of https://github.com/harfbuzz/harfbuzz/issues/1017

Part of https://github.com/harfbuzz/harfbuzz/issues/1017

Part of https://github.com/harfbuzz/harfbuzz/issues/1017

Part of https://github.com/harfbuzz/harfbuzz/issues/1017

For consistency.

Part of https://github.com/harfbuzz/harfbuzz/issues/1017

Suppress progress messages of ttx. This avoids comparing this output to the reference file which lets the test fail.

Fixes #779 and follow up to b01d9b3d

https://bugzilla.gnome.org/show_bug.cgi?id=659212 for more context

To revive Travis CI bot

A bit brute force and requires all shapers to be known, not just one.

Fixes https://github.com/harfbuzz/harfbuzz/issues/956