Line numbers in errors but not editor

[jaredkrinke]

Switching to Monaco could fix this

[jaredkrinke]

Explore these: https://stackoverflow.com/questions/1995370/adding-line-numbers-to-html-textarea

[jaredkrinke]

Almost got this working, but the textarea doesn't resize when exiting debug mode, and it sometimes doesn't seem to scroll to the active line at first.

The issue is that textareas just don't play nicely. A content editable div might work better.

Regardless, now that compilation errors are always selected, I think this it not important.

[jaredkrinke]

Feedback indicates that line numbers are important.