v0.1.6

• feat: search now accepts input from all major Buddhist scripts
• feat: add other abbreviations to db schema and search
• feat: in-app feedback form with online and offline handoff
• fix: confirm before exiting via Android back button
• fix: database download no longer hangs indefinitely
• fix: closest matches display as a clean vertical list
• feat: Android back button goes back to the previous search
• feat: variant readings expand with 'show more' & collapse with 'show less'
• fix: tap-to-search strips brackets from selected text
• fix: app update no longer interrupts in-progress database download