minor edits

use properties in showDiffViewSelector()

remove getDiffType()

new method setChangeLog()

change methods name

identify current rev in html form

use PageDiff::compareWith() for draft, conflict

define preProcess() method

fix checkbox value for current page

similarify MediaDiff and PageDiff classes

move media_diff() into Ui\MediaDiff class

deprecated functions:
media_diff()
_media_file_diff()
media_file_diff()
media_image_diff()

Ui\Diff hierarchy

Ui\Diff hierarchy

move Ui\Diff to Ui\PageDiff

UI\Revisions hierachy

define Revisions as abstract, which is inherited by PageRevision and MediaRevision classes. this is simillar to ChangeLog class hierachy.

create Ui\PageRevisions class

new Ui\PageRevisons is dedicated for page revisions

create UI\MediaRevisions class

Create new Ui\MediaRevisions class created by copying from Ui\Revisons and customize its methods to use media only (methods args are changed).
Replace deprecated html_

create UI\MediaRevisions class

Create new Ui\MediaRevisions class created by copying from Ui\Revisons and customize its methods to use media only (methods args are changed).
Replace deprecated html_revisions() with Ui\MediaRevisions->show() method.

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set proper revinfo when media meta file is not available

MediaChangelog::getRevision() may return false when media changes meta file is missing, cause error unsupported operand types.

use EDIT_FORM_ADDTEXTAREA

change event name to prevent breaks in old HTML_EDIT_FORMSELECTION or early proposed EDIT_FORM_ALTERNATE event handler, such as edittable plugin

use new event EDIT_FORM_ALTERNATE

to prevent breaks in old HTML_EDIT_FORMSELECTION event handler, such as edittable plugin

re-declare deprecated function html_edit_form()

call dbg_deprecated(), even this function lost compatibility because its argument $param['form'] has changed to hold Form\Form object

consistent html_buildlist() usage

see usage of html_buildlist in plugin acl (admin and action component)

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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change event naming scheme

FORM_*_OUTPUT scheme had been introduced since Apriil 2018, see #2286

fix Scrutinizer annotations