code style: operator spacing

Rector to rename print to echo calls

coding style: PSR12.Classes.ClassInstantiation.MissingParentheses

codestyle adjustments: class declaration braces

Apply rector fixes to inc/Action

re-declare deprecated functions for backward compatibility

`dbg_deprecated()` is called in `html_diff_head()`, `html_diff_navigation()`, `html_diff_navigationlink()`, and following functions:

* `h

re-declare deprecated functions for backward compatibility

`dbg_deprecated()` is called in `html_diff_head()`, `html_diff_navigation()`, `html_diff_navigationlink()`, and following functions:

* `html_denied()` is not used any plugins, but added fallback just in case.
* `html_locked()` is used by one third-party plugin (AjaxEdit), fallback should be added.
* `html_insert_softbreaks()` is used by one third-party plugin (TOS, terms of service), fallback should be added.

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Remove Ui\{Denide, Locked} class

They are not UI components. We should show error message in Action\{Denide, Locked}::tplContent() methods.

Ui\Locked class replaces html_locked()

Ui\Editor class replaces html_edit()

Fix Locked-Page not showing page content

While refactoring into inc/Action/Locked, the fall-through call
to html_edit was missed.
See 952acff90985f4576de0558a58a167372392e21c

This removed the edit

Fix Locked-Page not showing page content

While refactoring into inc/Action/Locked, the fall-through call
to html_edit was missed.
See 952acff90985f4576de0558a58a167372392e21c

This removed the edit box from the locked page, which is needed
for users to get the page source or by etherpad lite plugin.

This change re-adds the call to html_edit for the locked action.

Signed-off-by: Michael Braun <michael-dev@fami-braun.de>

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explicitly declare method visibility

more doc block fixes

all actions should have a class now

Lots of FIXMEs and the routing isn't integrated, yet