Floating Item Display

• Floating item displays can now be created over any block, rather then only above lodestones
• Added config toggles
  • boolean for whether or not creating a floating item display makes the supporting frame invisible (only affects new displays)
  • boolean for whether or not floating item displays' supporting item frame must be on top of a lodestone (retroactively affects all displays)

Config defaults to leaving item frames visible and not requiring lodestones
^{in spite of my (unreasonable) preference towards the lodestone requirement :(}

• Corrected some logic handling when to consider a floating item display no longer adequately supported by its frame/block
• Left-clicking a floating item display now immediately makes its supporting frame visible (makes it more clear that the vanilla item frame lingering thing is happening)
• Added pack initialization confirmation message and config prompt
• Removed pack reload message

config accessible via '/dialog show @s floating_item_display:config'