Make flashlights, atmos hardsuit, and RGB use the new layer features (#6253)

* Make flashlights, atmos hardsuit, and RGB use the new layer features

* avoid self-conflict

* fix rgb not updating on add

* cleanup

* Update Content.Client/Light/RgbLightControllerSystem.cs

Co-authored-by: mirrorcult <lunarautomaton6@gmail.com>

* cleanup diff

Co-authored-by: mirrorcult <lunarautomaton6@gmail.com>

Resources/Textures/Clothing/Head/Hardsuits/atmospherics.rsi/meta.json

@@ -10,31 +10,49 @@
     {
       "name": "icon"
     },
+    {
+      "name": "icon-unshaded"
+    },
     {
       "name": "icon-flash"
     },
     {
-      "name": "off-equipped-HELMET",
+      "name": "light-overlay"
+    },
+    {
+      "name": "equipped-head",
       "directions": 4
     },
     {
-      "name": "off-inhand-left",
+      "name": "equipped-head-light",
       "directions": 4
     },
     {
-      "name": "off-inhand-right",
+      "name": "equipped-head-unshaded",
       "directions": 4
     },
     {
-      "name": "on-equipped-HELMET",
+      "name": "inhand-left",
       "directions": 4
     },
     {
-      "name": "on-inhand-left",
+      "name": "inhand-left-unshaded",
       "directions": 4
     },
     {
-      "name": "on-inhand-right",
+      "name": "inhand-left-light",
+      "directions": 4
+    },
+    {
+      "name": "inhand-right",
+      "directions": 4
+    },
+    {
+      "name": "inhand-right-unshaded",
+      "directions": 4
+    },
+    {
+      "name": "inhand-right-light",
       "directions": 4
     }
   ]