Remove forgotten ActionController::requiresConfig() call

Should have been reverted by last commit but was not.
js/loader: remove pending request on form redirect

Our redirection helper catching forms redirecting to their source
while being shown right-hand left a pending request. Abort was triggered,
but had no effect as the request has already been completed.

fixes #6619
monitoring/list/hosts: restore page behaviour

The problem here was that an accidentally removed closing div tag in
15325949 caused the application to missbehave badly. Host details where
rendered below the list in some scenarios and the whole multicolumn
thingy started to feel broken.
monitoring/list: do not apply empty filter

Fixes problems with the servicematrix when no filter is applied.
I'm not yet happy with this, calls to where() should automagically
handle existing empty filters.

fixes #6543
FilterEditor: hide "add" links

They where there to show how this should look like. Removed for now as
they are not implemented yet.

refs #6668
js/loader: correctly get rid of data

I'm unsure whether this is a jQuery bug or not. The removeData()
function has no effect unless there is a matching data attribute.
Makes IMO no sense, as adding the attribute automagically adds data,
so why should removing it differ.

This patch makes sure that the corresponding attribute is removed too.
Fixes "dashboard sometimes flickering on refresh".

refs #6536
Use Icinga\Data\Db\DbConnection instead of Zend_Db_Select directly

fixes #6218
Consider is_active column when fetching host and service statistics

fixes #6157
Fix error message when no authentication method available

The error handling for configuration files has slightly changed (non
existent files are treated as empty) so the authentication chain handling
needed to be adjusted as well.

fixes #6268
Fix number formatting in chart classes

Use explizit number formatting instead of implicit type conversions when
rendering SVGs, to prevent a change of the locale from breaking the charts.

fixes #6585
Fix coding style
Determine the scale factor correctly

Fix error in the logic of the context renderer, that lead to a wrong scale factor
when the width was bigger than the height
Translate labels in the ChartController
Rename Icinga\Web\Form\Decorator\BootstrapForm

We do not use bootstrap anymore but do not want the default Zend
decorators either so this decorator got a more common name.

refs #5525
Refactor Icinga\Web\Form

We eagerly waited badly for a new approach to build forms, so here it is.
Should be the best compromise between the Zend_Form functionality and
our requirements regarding automatic submits.

refs #5525
Adjust Icinga\Form\Authentication\LoginForm to suit the new form builder

refs #5525
Adjust Icinga\Form\Config\LoggingForm to suit the new form builder

refs #5525