Apple has released iTunes 10.4 adding support for some of the new features in Mac OS X Lion and a number of important stability and performance improvements. iTunes 10.4 now works with Lion’s new Full-Screen App feature allowing the app to be placed in its own full-screen window. Version 10.4 is also now a 64-bit Cocoa application on OS X Lion, and the release notes indicate that this may render some plug-ins no longer compatible. The latest…