Rework ExamplesBank, generate inputs for synthesis

src/main/scala/leon/repair/Repairman.scala

src/main/scala/leon/synthesis/ChooseInfo.scala

src/main/scala/leon/synthesis/ExamplesBank.scala

src/main/scala/leon/synthesis/ExamplesFinder.scala

src/main/scala/leon/synthesis/Problem.scala

src/main/scala/leon/synthesis/SynthesisPhase.scala

src/main/scala/leon/synthesis/rules/ADTDual.scala

src/main/scala/leon/synthesis/rules/BottomUpTegis.scala

src/main/scala/leon/synthesis/rules/CEGISLike.scala

src/main/scala/leon/synthesis/rules/Disunification.scala

src/main/scala/leon/synthesis/rules/TEGISLike.scala

src/main/scala/leon/synthesis/utils/ExpressionGrammar.scala