SAN FRANCISCO - After two decades of touting its Macintosh as a superior alternative to PCs based on Intel Corp. chips and Microsoft Corp. software, Apple Computer Inc. announced plans to switch the Mac to the same Intel chips that have powered Windows-based machines for years.The deal, which has long been rumored, will help Apple better compete with the performance - and potentially the price - of Windows PCs. Still, Apple will continue to build its own computers and says it won't be licensing its software to other PC vendors.Speaking to thousands of software developers Monday at Apple's Worldwide Developers...