Move asset cache dir prints to framework init with the others. Prior to Fw::Initialize the log level is not set yet (should fix) and info prints will go out even if eg. --quiet is defined.
AssetCache: Remove duplicate assetDataDir that was used late in the day when we had 'data' and 'metadata' folders for Tundra cache. Now its just plain files in the main directory. Framework: Initialie a generic '<appdatadir>/cache' and point default asset cache to <appdatadir>/cache/assets. This cache dir can be used in the future for other caches like Urhos shader cache (?) and http request cache (outside of HttpAssetProvider).