[BUGFIX] Compatibility with HTML sanitizer in TYPO3 10.4.19 (543)

 [BUGFIX] Disable page content HTML sanitation

Disables HTML sanitation in pageContentPreProcessing. TYPO3 10.4.19 introduces a security-related HTML sanitation feature. The feature affects Frontend Editings pageContentPreProcessing TypoScript configuration, leading to all of the pages HTML being escaped. This is fixed by setting parseFunc.htmlSanitize  0.

Fixes 542

 [BUGFIX] Allow extra attributes in HTML sanitation

The DefaultSanitizerBuilder does not allow HTML tags to have the attributes contenteditable and placeholder, which are used by FrontendEditing. This is fixed by using a custom class (FrontendEditingSanitizerBuilder) that adds these attributes when FrontendEditing is enabled.

 [TASK] Raise version to 2.0.6