feat: Add a scroll() function to the string manipulation capabilities of Iniquity

# Synopsis
We have a lot of cool tricks for working with text that go beyond what Synchronet provides out of the box. Let's add a `scroll` function that could enable text scrolling.

Something like...
```ts
iq.say("I want this message scrolling from left to right.".scroll({width: 10, orientation: 'right-to-left'}).gotoxy(30,30))
```