Some juicy refactoring

src/main/scala/leon/Analysis.scala

src/main/scala/leon/ArrayTransformation.scala

src/main/scala/leon/EpsilonElimination.scala

src/main/scala/leon/FunctionClosure.scala

src/main/scala/leon/FunctionHoisting.scala

src/main/scala/leon/ImperativeCodeElimination.scala

src/main/scala/leon/Main.scala

src/main/scala/leon/Pass.scala

src/main/scala/leon/PassManager.scala

src/main/scala/leon/Settings.scala

src/main/scala/leon/Simplificator.scala

src/main/scala/leon/TypeChecking.scala

src/main/scala/leon/UnitElimination.scala

src/main/scala/leon/plugin/AnalysisComponent.scala

src/main/scala/leon/plugin/CodeExtraction.scala

src/main/scala/leon/plugin/LeonContext.scala

src/main/scala/leon/plugin/LeonPhase.scala

src/main/scala/leon/plugin/LeonPlugin.scala

src/main/scala/leon/plugin/SimpleReporter.scala

src/main/scala/leon/synthesis/Main.scala