Issues to fix in 3.6

[Sheep-y]

• [x] Empty search with sort is parsed incorrectly.
• [x] Exclude ritual flavor text from text index.
• [x] Exclude paragon path flavor text from text index.
• [x] Exclude epic destiny flavor text from text index.
• [x] Detect and hopefully fix flavor text that contains html.
• [x] Powers should be sorted by Class, Level, Frequency, then Name
• [x] Hybrid classes should be sorted last.
• [x] Move "Artifact" text from Type column to Rarity column.
• [x] Update frontpage video placeholder.
• [x] Rename "app" to "program" for the downloader.
• [x] Fix cat link layout issue e.g. Arrow (weapon219)
• [x] Don't jump to entry view on drag so that it is possible to select text on desktop.
• [x] Fix item name selection results in rarity lookup.
• [x] Fix prev/next button covered by content (mobile only?)
• [x] Fix long power class overlaping long power name (e.g. World Serpent paragon)
• [x] glossary670 creates a blank lookup entry.
• [x] Fix non-ascii lookup issue (e.g. Eyes of Selûne)
• [ ] Check why lookup "Dragon" give "Drag".
• [x] Searching "AV2" in sourcebook column of glossary yields non-AV2 results.
• [x] Switch language default to English.
• [x] Add quick lookup to context menu.
• [x] Toggle highlight menu label when on/off.
• [x] Remove viewer search cache to simplify code and save memory. Aborted because it speeds up going back to list
• [x] Allow control of thread count.
• [x] Catch that dreaded OutOfMemoryError.