Moved out smaller, helper components to a separate module.

We want to show pending changes always.

Remove duplicate, add search icon to input.

Now focus works.

I broke it in previous commit, by not caching ngramsTable in displayRow
and instead recomputing it every time from initTable.

Trying to make input work.

This could be more performant than Array. We don't do random access,
only filtering.

Related to #165.