* misc: slightly optimized rebuilding speed of decompressed files by using MoveFile instead of CopyFile if possible * misc: slightly optimized scanning speed of decompressed sets by using hash caches * misc: manufacturer tag isn't mandatory anymore in dtd and won't appear in export if empty * misc: show prompt if external packers are not available * fixed: profiler loading issues when having mess and mame xmls handy and defining mess dats in engine.cfg * fixed: utf boms (byte order marks) let the dat detection fail