Renamed task directories to simplify Gitlab navigation

Task_C/src/interpreter/lisp/Constants.java

Task_C/src/interpreter/lisp/Context.java

Task_C/src/interpreter/lisp/Eq.java

Task_C/src/interpreter/lisp/Expr.java

Task_C/src/interpreter/lisp/Fun.java

Task_C/src/interpreter/lisp/FunctionCall.java

Task_C/src/interpreter/lisp/InterpreterTest.java

Task_C/src/interpreter/lisp/Mult.java

Task_C/src/interpreter/lisp/Num.java

Task_C/src/interpreter/lisp/Reader.java

Task_C/src/interpreter/lisp/Sub.java

Task_C/src/interpreter/lisp/Symbol.java

Task_C/src/interpreter/lisp/test/AllTests.java

Task_C/src/interpreter/lisp/test/CompoundExpressionTest.java

Task_C/src/interpreter/lisp/test/ReaderTest.java

Task_C/src/polymorphism/ABaseClass.java

Task_C/src/polymorphism/ASubClass.java

Task_C/src/polymorphism/PolymorphismTest.java

Task_C/src/visitor/AbstractExpression.java

Task_C/src/visitor/CompoundExpression.java