implemented labels and goto parsing

examples/for.l

@@ -0,0 +1,21 @@
+import std::io;
+
+i32 main()
+{
+	[u32] list = [1, 2, 3, 4, 5];
+
+	// iterative loop
+	loop (0.., list) |i, v| {
+		printf("%d\n", i);
+	}
+
+	// conditional loop
+	loop a == 3 {
+
+	}
+
+	// infinite loop
+	loop {
+
+	}
+}