v0.4.0-alpha.1

In this version the fulltext search engine was replaced with tantivy, which is faster and uses MUCH less memory than the previous whoosh engine.

It also allows more complex search query expressions on the fulltext index, which is much faster to query than the SQL database.

Other improvements include:

• the app keeps running in the background, system tray icon shows the window again
• search input auto-completion allows Latin letters to match Pāli diacritics
• regex globbing (.* .+ a* a+) and fuzzy match on fulltext searches
• bind your OS keyboard shortcuts to open a certain window using command line arguments
• Linux: create or update .desktop app icon file