It’s been 18 years since AutoCAD ran on Macs, but now they’re back – and boy are they back. After a short period of existing only within the Windows realm, Autodesk is bringing their CAD software back to the Mac. Not only will the new version run on Macs, there will be an iPhone and iPad version too. In what might appear to be a gloomy announcement for Windows 7 and Windows Phone 7, Autodesk is finally acknowledging that a large segment of the high end computer market isn’t choosing the Microsoft route. With the Mac consistently growing it’s market share, it was finally time for a big software name to return…