Keep event-trap non-inline unless composing text

Inline blocks will cause the browser to allow word-wrapping to occur either side of the node, an effect that is VERY undesirable for a caret.

Making the event trap absolute, but expanded to the full height of the cursor shows the composition menu displays in the same place as if the trap was an inline-block. The cursor and trap are switched to inline
blocks during composition so the contained characters take up space in the document.

Addresses issue #86