Treat diagnostics as separate entity from stdout/stderr #127
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This PR sends tsserver diagnostics over a separate websocket event as a rich diagnostic object rather than a string message. This paves the way to do things like add squiggly lines under sections with errors, or highlight lines with errors.
I made one other change in this PR which has bugged me for a while: When you clear output, you should only be clearing the output of the current tab, not all tabs, which is confusing and annoying if you didn't mean to do that.