Lute v3

Tweaks:

• #540: revise popup: include more data, but make layout more compact.
• #541: change hotkeys to use “code” rather than “key letter pressed” so that people switching keyboard layouts can have constant shortcuts.
• #544: allow showing “Unknown” Terms in filtered Term listing.
• #527: Track words read in new wordsread table, allows for multiple re-reads of same page to be tracked in “words read” stats graph.

Fixes:

• #460: Set cascade delete database pragma on connect - ensures no orphaned data.
• #546: fix Bing translation lookups, Bing can be embedded for Term and Sentence lookups.
• Shift-drag copy shouldn’t close term form.