Escape text output in HTML Emitter

[bterlson]

No description provided.

[rbuckton]

Is it really necessary to take an external dependency for something as simple as HTML entity escaping?

[rbuckton]

There's already an encode method on Emitter that does this:

    protected encode(text: string) {
        return text.replace(/[&<>'"]/g, ch => {
            switch (ch) {
                case "&": return "&amp;";
                case "<": return "&lt;";
                case ">": return "&gt;";
                case "'": return "&apos;";
                case '"': return "&quot;";
            }
        });
    }

[rbuckton]

I've fixed the missing encoding cases using existing functionality. Closing this PR.

[bterlson]

I'll convert you to substackianism one day :-P But for now, thanks a bunch!!