Add event when animation finishes

[jcubic]

I have an idea for a new feature for jQuery Terminal

While working on Gaiman I've noticed that there is no easy way to know when to invoke the command after animation and before the promise is resolved when calling terminal::read.

What is needed is an event, maybe onAnimationEnd that can be used to read so you can call exec to fill the input:

const msg = await term.read("name? ", {
  typing: true,
  onAnimationEnd: () => {
    term.exec("Jakub", { typing: true });
  }
});

this should evaluate to string "Jakub" when both animations end.

[jcubic]

The syntax is as follows:

(async () => {
    const name = await term.read("name? ", {
        typing: true,
        onReady: () => {
            term.exec("Jakub", { typing: true });
        }
    });
    term.echo(`You're ${name}`);
})();

onReady is a better name here because it can be used without animation.