Add gradle.properties so project builds

code clean up and NPE fix

refactored to support latest jmap library version

updated dependencies

added logging backend for library logging

updated dependencies

update gradle, gradle-plugin + some dependencies

expand unread email and jump to first unread

refactor archive into abstract view model

allow archiving in search view

moved search suggestions into app database and use main repository

write threads and emails in single transactions

do not include current typed word in suggestions

SearchView.clearFocus() does not work on all phones

modify date display