feat: implement objects moving and borrowing

exl/raii.fzs

@@ -0,0 +1,34 @@
+class Animal
+{
+  str type;
+  str name;
+  int age;
+
+  fn copy() Animal
+  {
+    Animal cp = new Animal;
+    cp.type = this.type;
+    cp.name = this.name;
+    cp.age = this.age;
+
+    return cp;
+  }
+}
+
+Animal a = new Animal;
+a.type = "Cow";
+a.name = "Buryatka";
+a.age = 5;
+
+Animal b = a.copy();
+a.name = "Gavryusha";
+a.age = 10;
+
+printline(a);
+printline(b);
+
+if (a.type == b.type && a.name != b.name && a.age < b.age)
+  printline("Test passed");
+else
+  printline("Test failed");
+