fix: some furniture generates too many nails

while digging around looking for a cause of many, many nails spawning in
a farm house or something I found that smashing certain furniture gave
you 100x times of what it was supposed to give.
also deconstructing base carpets results in many, many nails

simple bug related to spawning items with a large default `count` and
`stack_size` with `count` in itemgroups or some other method of spawning
items

use `charges` when spawning nails as a product of smashing furniture

grep around for bash and deconstruct arrays, looking for mentions of
nails and `count`

data/json/furniture_and_terrain/furniture-decorative.json

@@ -246,7 +246,7 @@
       "sound_fail": "thump.",
       "items": [
         { "item": "pine_bough", "count": [ 4, 6 ] },
-        { "item": "nail", "count": [ 5, 14 ] },
+        { "item": "nail", "charges": [ 5, 14 ] },
         { "item": "stick", "count": [ 1, 3 ] }
       ]
     },
@@ -287,7 +287,7 @@
       "sound_fail": "thump.",
       "items": [
         { "item": "pine_bough", "count": [ 4, 6 ] },
-        { "item": "nail", "count": [ 5, 14 ] },
+        { "item": "nail", "charges": [ 5, 14 ] },
         { "item": "stick", "count": [ 1, 3 ] }
       ]
     }

data/json/furniture_and_terrain/furniture-recreation.json

@@ -599,7 +599,7 @@
       "sound_fail": "whump.",
       "items": [
         { "item": "2x4", "count": [ 2, 4 ] },
-        { "item": "nail", "count": [ 5, 18 ] },
+        { "item": "nail", "charges": [ 5, 18 ] },
         { "item": "splinter", "count": [ 5, 17 ] }
       ]
     }
@@ -623,7 +623,7 @@
       "sound_fail": "thump!",
       "items": [
         { "item": "2x4", "count": [ 2, 4 ] },
-        { "item": "nail", "count": [ 5, 18 ] },
+        { "item": "nail", "charges": [ 5, 18 ] },
         { "item": "splinter", "count": [ 5, 17 ] },
         { "item": "scrap", "count": [ 15, 60 ] }
       ]

data/json/furniture_and_terrain/terrain-floors-indoor.json

@@ -669,7 +669,7 @@
       "str_min_supported": 100,
       "items": [ { "item": "cotton_patchwork", "count": [ 10, 20 ] }, { "item": "nail", "charges": [ 1, 3 ] } ]
     },
-    "deconstruct": { "items": [ { "item": "r_carpet", "count": 1 }, { "item": "nail", "count": [ 2, 5 ] } ], "ter_set": "t_floor" }
+    "deconstruct": { "items": [ { "item": "r_carpet", "count": 1 }, { "item": "nail", "charges": [ 2, 5 ] } ], "ter_set": "t_floor" }
   },
   {
     "type": "terrain",