Move target selector to toplevel; add strings and icons

homeassistant/components/light/icons.json

@@ -22,5 +22,10 @@
     "turn_on": {
       "service": "mdi:lightbulb-on"
     }
+  },
+  "triggers": {
+    "state": {
+      "trigger": "mdi:state-machine"
+    }
   }
 }

homeassistant/components/light/strings.json

@@ -461,5 +461,18 @@
         }
       }
     }
+  },
+  "triggers": {
+    "state": {
+      "name": "State",
+      "description": "When the state of a light changes, such as turning on or off.",
+      "description_configured": "When the state of a light changes",
+      "fields": {
+        "state": {
+          "name": "State",
+          "description": "The state to trigger on."
+        }
+      }
+    }
   }
 }

homeassistant/components/light/triggers.yaml

@@ -1,11 +1,8 @@
 state:
+  target:
+    entity:
+      domain: light
   fields:
-    target:
-      required: true
-      selector:
-        target:
-          entity:
-            domain: light
     state:
       required: true
       selector: