Give the FN SCAR its attachment points back (CleverRaven#66888)

* Give FN SCAR back its attachments

* Give FN SCAR missing variables.json

* Un-add some added attachment points

Remove obsolete accessory points

Co-authored-by: TheShadowFerret <99621099+TheShadowFerret@users.noreply.github.com>

* Use the whole quad rail

Co-authored-by: TheShadowFerret <99621099+TheShadowFerret@users.noreply.github.com>

---------

Co-authored-by: TheShadowFerret <99621099+TheShadowFerret@users.noreply.github.com>

data/json/items/gun/223.json

@@ -370,6 +370,7 @@
   },
   {
     "id": "scar_l",
+    "copy-from": "rifle_semi",
     "type": "GUN",
     "name": { "str": "FN SCAR-L" },
     "description": "A highly accurate and modular assault rifle specially designed for the United States Special Operations Command.  The 'L' in its name stands for light, as it uses the lightweight .223 round.",
@@ -381,7 +382,7 @@
     "price": 540000,
     "price_postapoc": 2250,
     "to_hit": -1,
-    "skill": "rifle",
+    "material": [ "steel", "aluminum", "plastic" ],
     "symbol": "(",
     "color": "dark_gray",
     "ammo": [ "223" ],
@@ -390,6 +391,20 @@
     "min_cycle_recoil": 1350,
     "modes": [ [ "DEFAULT", "semi-auto", 1 ], [ "AUTO", "auto", 4 ] ],
     "default_mods": [ "high_end_folding_stock" ],
+    "valid_mod_locations": [
+      [ "barrel", 1 ],
+      [ "bore", 1 ],
+      [ "brass catcher", 1 ],
+      [ "grip", 1 ],
+      [ "mechanism", 4 ],
+      [ "muzzle", 1 ],
+      [ "rail", 2 ],
+      [ "sights", 1 ],
+      [ "sling", 1 ],
+      [ "underbarrel", 1 ],
+      [ "stock accessory", 2 ],
+      [ "stock", 1 ]
+    ],
     "pocket_data": [
       {
         "pocket_type": "MAGAZINE_WELL",