Fixes #18317 - Clone user role via API

Fixes #14492 - Unify delete and minimize for dashboard widgets

Originally the idea was for the buttons to have a different effect on
the widgets, however with changes introduced later on these differences
have been reduced to being insignificant.

Fixes #18345 - Improve templates error handling

Fixes #18768 - remove generic inline helps

Fixes #18763 - Change delete button to standard style

Fixes #18740 - remove erb extension from host_checkbox.js

Fixes #18514 - switch prefix/mask fields

fixes #18735 - truncate encryption key to match preferred length (#4350)

Ruby 2.4's OpenSSL bindings raise an ArgumentError during encryption if
the key length exceeds the cipher's configured length (32 bytes with the
default cipher), but the verification hash algorithm still uses the full...

fixes #18662 - stop default scope being overridden by association

Ensure the Taxonomix empty default scope isn't overridden by association
scopes which (effectively) calls `.where(:id => ...)` and overrides the
value of :id set in this default scope. This occurs on Rails 5.0 which...

fixes #18676 - don't ignore notification expiry

This also adds the ability to mass refresh expiry dates.