Simplified the compiler locating and loading process. ClassLoaders are used to dynamically load any needed compilers without requiring a restart. Added JDKToolsLibrary and JarJDKToolsLibrary which handle the process of searching for tools.jar files and create the appropriate CompilerInterface and Debugger objects. Removed all unnecessary compiler adapters and other compiler model support classes. Modified DefaultGlobalModel to use the JDKToolsLibrary classes when it is created.