[Xon] Moderator Essentials 2.6.0

• Convert "[ModEss] Can Use Thread Notes" from general moderation permissions to forum moderation permissions

• v2.5.0+ requires XenForo 2.2+ and php 7.2+, v2.4.x and below supports XF2.1 and are still supported.
• Harden templates for future upgrades
• Fix XF2.2 thread type support for "Thread Notes" feature.
• Fix possibility of having multiple "Thread Notes" discussion threads per actual thread due to previous schema design
• Remove "Moderator Action Discussion" feature as this featured heavy duplication of the "Thread Notes" features & code.
  • Attempts to migrate "Moderator Action Discussion" threads into a "Thread Notes" discussion thread, if the relevent thread does not have one.
  • Orphaned "Moderator Action Discussion" threads are left-alone as they still link to to the thread/post and include the action which triggered them.

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Fix type error in "Convert posts to conversation"

• Requires php 7.0+
• Now depends on Standard Library by Xon
• Confirm XF2.2 support