feat: add construction of wind turbines on roofs

[Lamandus]

Purpose of change

This adds the possibility to construct wind turbines on roofs. It require (imaginary) bolts and metal frames for securing it up there.

Describe the solution

Describe alternatives you've considered

Testing

Additional context

Checklist

[chaosvolt]

Uuuugh that looks hacky, you've got to specify multiple redundant construction entries for every possible variation of roofs and you didn't even get them all in the process. Plus this falls apart for any building that has outdoor floors instead of roof tiles.

[Lamandus]

Uuuugh that looks hacky, you've got to specify multiple redundant construction entries for every possible variation of roofs and you didn't even get them all in the process. Plus this falls apart for any building that has outdoor floors instead of roof tiles.

which one did I miss? and yes, there is no good other way to deal with it, the hacky thing is something you can't circumvent. And there are rarely roofs with regular tiles. So that works out for now.

[Lamandus]

Uuuugh that looks hacky, you've got to specify multiple redundant construction entries for every possible variation of roofs and you didn't even get them all in the process. Plus this falls apart for any building that has outdoor floors instead of roof tiles.

This is what happens if you use "copy-from":

There is no way to define an array of pre-terrains. If anyone can provide this kind of solution, I would use it, CV.

[scarf005]

Cataclysm-BN/doc/src/content/docs/en/mod/json/reference/json_info.md

Lines 863 to 864 in 5960913

	"pre_flags": [ "DIGGABLE", "FLAT" ], // (Optional) Flags the terrain must have to be built on
	"pre_terrain": "t_pit", // (Optional) Required terrain to build on

this PR adds many duplicate entries, maybe we could remove pre_terrain and replace it with pre_flags?

[Lamandus]

@scarf005

 {
    "type": "terrain",
    "id": "t_flat_roof",
    "name": "flat roof",
    "description": "A flat, gray section of rooftop.",
    "symbol": ".",
    "looks_like": "t_concrete",
    "color": "dark_gray",
    "move_cost": 2,
    "flags": [ "TRANSPARENT", "FLAT" ],
    "bash": { "str_min": 30, "str_max": 210, "sound": "crash!", "sound_fail": "whump!", "bash_below": true }
  },

the problem is, we don't have a "hard roof" flag. Because a roof tag isn't enough, you shouldn't place it on a thatched roof. Should I really start with a new flag just for this?

[scarf005]

Should I really start with a new flag just for this?

this sounds much better in the long-term, as new flags can be used to simplify other building requirement. current solution of duplicating entries aren't scalable.

or we could just accept anything FLAT is good enough and install windmill on vinyl roof

[scarf005]