Add switchgear preset (#1059)

Author: arch0345

data/presets/power/switchgear.json

@@ -0,0 +1,14 @@
+{
+    "icon": "temaki-power_switch",
+    "fields": [
+        "voltage",
+        "location"
+    ],
+    "geometry": [
+        "area"
+    ],
+    "tags": {
+        "power": "switchgear"
+    },
+    "name": "Switchgear"
+}