the name of the metadata property to get.
The current value of the metadata property, or the default if it is not set, NULL for properties with no default.
Threadsafety: It is safe to call this function from any thread, although the string returned is not protected and could potentially be freed if you call SDL_SetAppMetadataProperty() to set that property from another thread.
Get metadata about your app.
This returns metadata previously set using SDL_SetAppMetadata() or SDL_SetAppMetadataProperty(). See SDL_SetAppMetadataProperty() for the list of available properties and their meanings.