GSoC project `ftinspect` now in master

Folks,


I've just merged Charlie's GSoC project `ftinspect` into master –
enjoy!

`ftinspect` is a essentially a Qt-based application that merges and
extends the functionality of most FreeType demo programs (`ftview`,
`ftgrid`, etc.)

Charlie did a great job, and it was a pleasure to work with him.
Hopefully, he will find time and interest in the future to contribute
to FreeType.

For a meson build, compile in the usual way from the top directory of
`freetype-devel`, for example

```
meson setup meson-build
meson compile -C meson-build
```

For a CMake build, start in directory `src/ftinspect`:

```
cmake -B cmake-build
cmake --build cmake-build --parallel
```

Please test, and please report any issues in the bug tracker at

  https://gitlab.freedesktop.org/freetype/freetype-demos/-/issues


    Werner