IVYDE-152 : Support for Eclipse variables
- make the ivy settings path editor and the property file editor support eclipse varibles
- move the settigns editor so it's own tab as it is bigger now
- add some test projects to test the feature
This will also resolve IVYDE-183 and IVYDE-138
IVYDE-178:
- change the way IvyDE store its configuration : use extra attributes, so it does fix the raised issue.
- some refactoring : split very big java classes into sevral ones, like the IvyClasspathContainerConfiguration