[Util] Moved XDG::Item::Type to XDG::Type.
[Util] XDG::ToPaths().
[Util] List desired item types in ItemsFinder ctor.
[Util] Added XDG::ItemsDatabase.

Auto-updatable ItemsFinder that wathces its directories.
[Launchy] Use ItemsDatabase.
[Core] Added call to XInitThreads().
[Util] Added XDG::Cat2Items_t typedef.
[Util] Async scan/parse after first run in ItemsFinder.