Fixes #23782 - restore login disabling

Fixes #23169 - Orders settings alphabetically

Fixes #17204 - Sort setting UI category tabs consistently

Fixes #17844 - unify test mail js code

Fixes #12156 - Adds email configuration into Foreman settings

Instead using email.yaml, the email configuration
can be modified dynamically via settings.

Fixes #17120 - Allow custom name for setting category

Fixes #12945 - use helper for table css classes

Fixes #7167 - names of settings marked for translation

Fixes #9589 - Add documentation button to various models

Fixes #8785 - HTML syntax fixes - add thead/tbody, fix formatting

fixes #2407 - Add STI to settings model

Also adds some tests for rendering new/missing STI models, and
refactors the old default_settings loader into the new sub-models.

Feature #2368 - form helpers, exceptions and fixes

Feature #2368 - host list popups and various fixes

Feature #2368 - i18n extracting strings

fix minor css classes declaration.

setting page has tabs for categories, yeh!

this also fixes #1742

[UI] - make sure settings intput fields do not resize incorecctly upon inline edit

updates UI to bootstrap v2

changed 'settings' to 'more', and 'oreman settings' to 'settings'

clean up unused views and tests, refs #1184

refs #1184 - added editing of true / false values in settings page

Feature #1184 - allow to save array based settings

this also moves the setting page to use inline edit

fixes #322 Ability to add custom variables and multiple values resovled
in a dynamic Hierarchally order

This commits introduces the ability to define variables per puppet
class.

additionally, each class can have multiple values, depends on the host
which is requesting that variable....

splitted setting default data from the migration
this allows to add new data and modify its defaults
improved settings UI a bit more
refs #100

fixes #100 - Setting is now a ActiveRecord object

This allows users to manage foreman settings via the UI.

the UI is a bit ugly, but works :)