LPS-41243 Move getPortletDisplayTemplateHandlers logic to util class
LPS-41243 Include PortletDisplayTemplateHandlers from plugins (bug fix)
LPS-41243 Rearrange code
LPS-41243 Sort Application Display Templates by name
LPS-41243 Fix groupId error when adding Application Display Templates
LPS-41243 SF
LPS-41243 See *Comparator.java (most are in its own dir)