Adds Science, Chemistry, Mime Duffelbags. (#3026)

* Sprites

* Entities

* Adds fills and roles

* Cleans up inconsistent duffel bag naming.

Resources/Textures/Clothing/Back/Duffels/science.rsi/meta.json

@@ -0,0 +1,27 @@
+{
+  "version": 1,
+  "license": "CC-BY-SA-3.0",
+  "copyright": "Taken from tgstation at commit https://github.com/tgstation/tgstation/commit/547852588166c8e091b441e4e67169e156bb09c1",
+  "size": {
+    "x": 32,
+    "y": 32
+  },
+  "states": [
+    {
+      "name": "icon",
+      "directions": 1
+    },
+    {
+      "name": "equipped-BACKPACK",
+      "directions": 4
+    },
+    {
+      "name": "inhand-left",
+      "directions": 4
+    },
+    {
+      "name": "inhand-right",
+      "directions": 4
+    }
+  ]
+}