Adds portable flasher (#4523)

Co-authored-by: Paul Ritter <ritter.paul1@googlemail.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>
Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Resources/Textures/Objects/Weapons/pflash.rsi/meta.json

@@ -0,0 +1,30 @@
+{
+  "version": 1,
+  "license": "CC-BY-SA-3.0",
+  "copyright": "Taken from tgstation at commit https://github.com/tgstation/tgstation/commit/f349b842c84f500399bd5673e5e34a6bc45b001a",
+  "size": {
+    "x": 32,
+    "y": 32
+  },
+  "states": [
+    {
+      "name": "off"
+    },
+    {
+      "name": "on"
+    },
+    {
+      "name": "on-unlit"
+    },
+    {
+      "name": "flashing",
+      "delays": [
+        [
+          0.1,
+          0.1,
+          0.1
+        ]
+      ]
+    }
+  ]
+}