Removed unused CSS resource file in LaunchAnalysisWidget.
Fixed AppTemplate edited_date and published_date fields.
CORE-4646 Added Public App Warning to AppTemplateWizard.

Added is_public flag to AppTemplate.
Replaced obsolete AppTemplateWizardAppearance#createEmptyToolText with createEditPublicAppWarning.
Updated AppTemplateWizard#setValue to add this red-text warning with contextual help to the AppTemplateContentPanel header when the given AppTemplate is public.