XWIKI-13745: Many classes have the wrong TextArea content type

...notation/internal/AnnotationClassDocumentInitializer.java

...g/xwiki/edit/internal/EditorClassDocumentInitializer.java

...o-skin-resources/src/main/resources/flamingo/editclass.vm

...xwiki/mail/internal/MailMandatoryDocumentInitializer.java

...ava/com/xpn/xwiki/plugin/mailsender/MailSenderPlugin.java

...ternal/mandatory/XWikiPreferencesDocumentInitializer.java

...rc/main/java/com/xpn/xwiki/objects/classes/BaseClass.java

...ain/java/com/xpn/xwiki/objects/classes/TextAreaClass.java

...in/java/com/xpn/xwiki/objects/meta/TextAreaMetaClass.java

...wikimacro/internal/WikiMacroClassDocumentInitializer.java

...eduler/internal/SchedulerJobClassDocumentInitializer.java

...nx/internal/AbstractSkinExtensionDocumentInitializer.java

...tension/internal/UIExtensionClassDocumentInitializer.java