Nyall Dawson 976c86d03d Implement lazy initialization of default style library
Populating the style library from the database can be a time
consuming process, especially if a user has many symbols
present in their library.

But for many standalone scripts, and for qgis_process, the
style database may not be required.

Let's defer initialization of it until it's actually required,
saving the startup cost in qgis_process and 3rd party scripts.

On my system with a style database containing ~700 items this
cuts down qgis_process startup times by around 25%
2024-01-10 12:24:59 +10:00
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