Do not modify original behavior when reading a non-xml project
Load Xcode3Core.ideplugin instead of DevToolsCore.framework

Although the `Xcode3Core.ideplugin` name might suggest otherwise, the DevToolsCore framework inside the Xcode.app/Contents/OtherFrameworks directory is an older version of the framework than the one inside Xcode3Core.ideplugin/Contents/Frameworks.

The old version has old bugs, such as not supporting emoji for example.