Create a commonized build task to copy files resources as assets and add initialization provider to extract them at first run

[atsushieno]

While creating aap-juce-audible-planets port, I noticed that there would be common build task to copy some local contents as assets to extract under app-specific file at the initial run time. AudiblePlanets requires its presets repo contents copied into certain local data directory.

aap-lv2-sfizz does first-run setup for sfz too. We should provide some common build targets to achieve that.