Fixes in suggestion updating background thread operation
Moving loading of Clojure RT and dictionary to background so UI becomes visible quickly (no need for futures now)
Loading first only most common words quickly and then more slowly the full dictionary
Return to use simple list filtering for searching by pinyin.

Indexes by pinyin-start made it quicker but when we now (1) update the suggestion list in background and
(2) have the database words always sorted according to usage-count, we very quickly and undisturbingly get the
top hits populated.
English suggestions working. Better table layout by shortcut as proper column.