[New Port Request] lilv

[DomClark]

Library name:
lilv

Library description:
From the project homepage:

Lilv is a C library (with Python bindings) for simple use of LV2 plugins in applications, which includes utilities for investigating installed LV2 plugins.

On LV2:

LV2 is an extensible open standard for audio plugins. LV2 has a simple core interface, which is accompanied by extensions that add more advanced functionality.

Source repository URL:
https://gitlab.com/lv2/lilv

Project homepage (if different from the source repository):
https://drobilla.net/software/lilv

Anything else that is useful to know when adding (such as optional features the library may have that should be included):
This library has four dependencies, lv2, serd, sord, and sratom, none of which are currently in vcpkg. I am ready to open pull requests to add these, and can open individual port request issues if desired, but thought it best to ensure the end goal was acceptable first.
The build system (and that of the dependencies) is waf-based (actually a slightly modified version, autowaf). I have rewritten enough of it in CMake to build what I need, but this may be worth revisiting if something like #1312 is merged.