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 #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.

refs #17545 - notifications should be deleted with blueprint

refs #17228 - modify, don't re-define existing constant

Prevents warnings during startup:

app/models/setting/provisioning.rb:9: warning: already initialized constant Setting::BLANK_ATTRS
    app/models/setting.rb:13: warning: previous definition of BLANK_ATTRS was here

Refs #17272 - fix sql condition

1==1 is not a valid SQL condition.

Fixes #17272 - Fixed Searches on parameters with !=

Fixes #18426 - Add actions to notification entries

This adds support for the notifications to display actions. In case no
actions are provided, the dropdown kebab isn't shown. The actions
possible right now only include GET links.

Fixes #17228 - Select templates as global defaults (#4283)

This should allow user to select templates that will be used
for building PXE Default on TFTP proxy. These templates will
not be updated from seeds during updates.