Edit the `AST` Class to allow to add a `;` on command.

We currently cannot create `resources` with the `ResourcesGenerator` without appending a `;` to the `toCode` method as if we remove the appended semicolon it ends up generating "invalid" code as it is missing the last semicolon.

In this specific case we are using a `PhpFile` class which inherits from `AST`. So there is a bit of hoops that we might need to work on in order to make be able to add a semi colon to our files when we need them.