add context analysis and custom visitors

src/main/java/de/hsrm/compiler/Klang/Value.java

@@ -1,55 +1,13 @@
 package de.hsrm.compiler.Klang;
 
 public class Value {
+    private Object value;
 
-  public static Value VOID = new Value(new Object());
+    public Value(Object value) {
+        this.value = value;
+    }
 
-  final Object value;
-
-  public Value(Object value) {
-      this.value = value;
-  }
-
-  public Integer asInteger() {
-    return (Integer)value;
-  }
-
-  public String asString() {
-      return String.valueOf(value);
-  }
-
-  public boolean isDouble() {
-      return value instanceof Double;
-  }
-
-  @Override
-  public int hashCode() {
-
-      if(value == null) {
-          return 0;
-      }
-
-      return this.value.hashCode();
-  }
-
-  @Override
-  public boolean equals(Object o) {
-
-      if(value == o) {
-          return true;
-      }
-
-      if(value == null || o == null || o.getClass() != value.getClass()) {
-          return false;
-      }
-
-      Value that = (Value)o;
-
-      return this.value.equals(that.value);
-  }
-
-  @Override
-  public String toString() {
-      return String.valueOf(value);
-  }
+    public int asInteger() {
+        return (int) this.value;
+    }
 }