Can access private properties when using `this`

You can access private properties if you use `this.` to access them.

```asc
class Base {
	private string m_test = "hello world";
}

class Foo : Base {
	void Something() {
		print(this.m_test); // works
		print(m_test); // illegal access
	}
}

void Main() {
	Foo().Something();
}
```