eg. lilv_state_new_from_instance(), when and if already
provided by the caller/host (eg. qtractor).
Resolves promised qtractor method to bundle all SFZ <region>
files to an archive/zip (*.qtz) session file, an old feature
applicable to LV2 plugins.
See also: https://github.com/rncbc/qtractor/issues/427
- Rename some SFIZZ_ prefixed definitions where possible to permit some modules
to be generic and be reused in other projects, keep project' information
in the same place and more explicit
- Fixed non-compliant code formatting
