Delete unused libraries + refactor refactoring package

Delete unused libraries and refactor refactoring package to expand the
plugin
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/codeimp/IComparator.java
	src/codeimp/refactoring/AtomicRefactoring.java
	src/codeimp/refactoring/FieldUsedMethodFilter.java
	src/codeimp/refactoring/IExtractor.java
	src/codeimp/refactoring/IPerformable.java
	src/codeimp/refactoring/Scheduler.java
	src/codeimp/test/ProgressPage.java
	src/codeimp/test/ScoresCollection.java
	src/codeimp/test/TestActionDelegation.java
	src/codeimp/test/TestActionWizard.java