UML Modeler Code

- implementing model linker and linkWithType() methods in OOClass, OOAttribute and OOMethod

- refactoring

- code cleaning

- adding OOEnum class
- adding AbstractModelGenerator class, JavaModelGenerator extends from it
- compilation unit parser method "generateModel()" in JavaModelGenerator
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- adding detectImport
- adding OOImport class
- adding CompilationUnit class
- removing Has.*Mod interfaces

- adding detectImport
- adding OOImport class
- adding CompilationUnit class
- removing Has.*Mod interfaces

- adding detectImport
- adding OOImport class
- adding CompilationUnit class
- removing Has.*Mod interfaces

- adding detectImport
- adding OOImport class
- adding CompilationUnit class
- removing Has.*Mod interfaces

- adding global ClassDetector
- enhancing testcases