Stops structures from being built on dense objects

[VileBeggar]

About the pull request

stops structures like girders, beds, chairs and tables from being able to be built on top of dense objects (like tables and window frames)
fixes #6436

Explain why it's good for the game

stops weird things like this from being able to be constructed.

Testing Photographs and Procedure

Screenshots & Videos

i tested it very lightly with some generic constructions and it seems to work fine

Metal.Fix.mp4

Changelog

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fix: You can no longer build structures on top of dense objects. This prevents weird layering happening with walls and tables, window frames, etc.
/:cl:

[Venuska1117]

can you include doors too? seeing wall after you destroy electrocuted doors always haunt me.

[Diegoflores31]

This can be very problematic untill Girders are properly fixed to have a 0 health sprite. currently broken girders are invisible and have no sprite . this could cause issues if this PR is merged since you wont be allowed to build because of a invisible structure

[VileBeggar]

can you include doors too? seeing wall after you destroy electrocuted doors always haunt me.

sure, no biggie. it's a bit scummy and doesn't make much sense either.

This can be very problematic untill Girders are properly fixed to have a 0 health sprite. currently broken girders are invisible and have no sprite . this could cause issues if this PR is merged since you wont be allowed to build because of a invisible structure

destroyed girders are not dense and therefore will not block construction. they will, however, allow building on top of them, and then welding them up to a girder again. that lets you make a wall on top of other stuff which is what this pr is supposed to fix. either way it's not a hard fix to make so i'll get it done, thanks for bringing it up