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The purpose of this pull request is to fix compatibility with the Tapeline mod.
Tapeline mode creates temporary entities as player is drawing the tapelines using the tapeline selection tool.
When such entities are placed when auto-approvals are disabled by Construction Planner, they end-up being picked up as normal ghosts, and leave "phantom" ghost placeholders that can never be built. This problem is solved by adding checks to Construction Planner to see if the ghosts are marked as selectable (Tapeline marks such entities as non-selectable).
The other problem is when Tapeline is dragged over the existing unapproved ghosts. In that case the unapproved ghosts are approved by mistake during the invocation of
on_pre_buildevent handler (as Tapeline's ghost entities are getting built on the surface). This one is a bit trickier to fix, but I think the proposed commit should be a good enough solution (checking if player is holding selection tool and if that selection tools places non-selectable entities/ghosts).