[!!!][FEATURE] Refactor, cleanup and enhance

[webian]

Please check this PR carefully before merge it, because many things have been changed:

[!!!][TASK] Rename URL parameter frontend_editing to fe_edit to avoid confusion between URL parameter and extension name [TASK] Streamlined codebase
[DOCS] Fix and update documentation
[TASK] Fix CGL
[TASK] Streamline access service
[BUGFIX] Display pagetree on BE reload. Resolves: #713 [TASK] Don't set module name
[BUGFIX] Don't override window.TYPO3.settings
[BUGFIX] Persist also current preset in moduleData.web_view.States [TASK] Remove no more used editorConfigurationUrl parameter [TASK] Rename "Right bar" to "Content Elements Toolbar" [!!!][TASK] Move config.tx_frontendediting.settings.customRecords to module.tx_frontendediting.settings.customRecords [TASK] Move content elements toolbar from iframe to module body. Resolves: #705 [TASK] Improve style of content elements toolbar
[TASK] Streamline scroller area bars
[BUGFIX] Fix hide content toolbar
[TASK] Rename topBar in ckeditorBar
[TASK] Streamline CKEditor bar
[TASK] Move CKEditor bar inside module doc header
[FEATURE] Use customized CKEditor openlink plugin to handle frontend links navigation [TASK] Remove new CE button from inline actions
[TASK] Remove no more used 'new' action
[TASK] Remove move buttons from inline actions
[TASK] Remove no more used processRequest 'move' action [TASK] Upgrade setup for fluid_styled_content v11
[TASK] Remove obsolete CompatibilityUtility
[TASK] Remove no more used BackendConfigurationManager class [TASK] Remove obsolete HtmlParser.php
[TASK] Remove obsolete PageRenderer.php
[TASK] Remove unused ContentObjectRenderer.php
[TASK] Remove NotFoundView.php
[TASK] Remove no more used $table
[TASK] Remove unused getTypoScriptConfiguration
[TASK] Remove no more used SvgViewHelper.php
[TASK] Move toastr alerts to the right like in TYPO3 BE [BUGFIX] Cache already disabled in FrontendEditingInitiator.php [BUGFIX] Allow new CE and move CEs only in default language or translation not in connected mode [FEATURE] Add page path to module doc header
[TASK] Improve graphic of CKEditor toolbar
[TASK] Remove page refresh button
[FEATURE] Add clear cache button
[BUGFIX] Toggle new CE button disactivated when new CE dropped [BUGFIX] Handle null $content
[TASK] Remove no more needed data-new-url
[FEATURE] CTRL+click links to navigate
[TASK] Fix toastr colors to match TYPO3 flash messages colors [TASK] Add info notification
[TASK] Allow navigation of links in not editable CE only with the CTRL key [TASK] Remove unused translateKeys from GUI.js
[BUGFIX] Fix unsaved changes dialog. Resolves: #716 [BUGFIX] Display drag&drop handle only in default language or not connected translation mode [BUGFIX] Avoid PHP 8 warnings
[FEATURE] Add CE language icon to its inline action. Resolves: #692

Resolves: #716
Resolves: #713
Resolves: #705
Resolves: #692
Resolves: #675
Resolves: #639
Resolves: #513

[MattiasNilsson]

Wow this is amazing!!!