Add salvage & botany backpacks (#11445)

* Add salvage & hydroponics backpacks

* Fix path

* Add new salvage backpacks to starting gear

* Add new botany duffle to starting gear

* Add botany duffle to hydrobe vending

Resources/Textures/Clothing/Back/Satchels/salvage.rsi/meta.json

@@ -0,0 +1,26 @@
+{
+  "version": 1,
+  "license": "CC-BY-SA-3.0",
+  "copyright": "Taken from tgstation at commit https://github.com/tgstation/tgstation/commit/2e24b7af2221928e4b844a29408e821b60a5fe29",
+  "size": {
+    "x": 32,
+    "y": 32
+  },
+  "states": [
+    {
+      "name": "icon"
+    },
+    {
+      "name": "equipped-BACKPACK",
+      "directions": 4
+    },
+    {
+      "name": "inhand-left",
+      "directions": 4
+    },
+    {
+      "name": "inhand-right",
+      "directions": 4
+    }
+  ]
+}