Add class support with constructors, fields, and methods

projects/classes.j

@@ -0,0 +1,11 @@
+class Dog:
+    fn init(self, name):
+        self.name = name
+
+    fn bark(self):
+        println("guau!")
+
+d = Dog("ahi te va")
+x = d.bark()
+println("Hola ", d.name)
+debugHeap()

projects/custom_fn.j

@@ -1,4 +1,8 @@
-fn greet(name):
-    println("Hola, " + name)
+x = "Hello world!"
 
-greet("mundo!")
+fn suma(x, y):
+    fn pow(z):
+        return z * z
+    return x + pow(y)
+
+println(suma(2, 2))