Adds mice (#3594)

* Initial

* Mmm

* Adds them to map

* Makes mice grindable

* meta.json looking nice

* Mice go squeak

* Ye

* E

* Review

* Update Content.Server/GameObjects/Components/Mobs/Speech/MouseAccentComponent.cs

Co-authored-by: Paul Ritter <ritter.paul1@googlemail.com>

Resources/Textures/Clothing/Head/Animals/mouse_brown.rsi/meta.json

@@ -1,26 +0,0 @@
-{
-  "version": 1,
-  "license": "CC-BY-SA-3.0",
-  "copyright": "Taken from tgstation at commit https://github.com/tgstation/tgstation/commit/4f6190e2895e09116663ef282d3ce1d8b35c032e",
-  "size": {
-    "x": 32,
-    "y": 32
-  },
-  "states": [
-    {
-      "name": "icon"
-    },
-    {
-      "name": "equipped-HELMET",
-      "directions": 4
-    },
-    {
-      "name": "inhand-left",
-      "directions": 4
-    },
-    {
-      "name": "inhand-right",
-      "directions": 4
-    }
-  ]
-}

Resources/Textures/Clothing/Head/Animals/mouse_gray.rsi/meta.json

@@ -1,26 +0,0 @@
-{
-  "version": 1,
-  "license": "CC-BY-SA-3.0",
-  "copyright": "Taken from tgstation at commit https://github.com/tgstation/tgstation/commit/4f6190e2895e09116663ef282d3ce1d8b35c032e",
-  "size": {
-    "x": 32,
-    "y": 32
-  },
-  "states": [
-    {
-      "name": "icon"
-    },
-    {
-      "name": "equipped-HELMET",
-      "directions": 4
-    },
-    {
-      "name": "inhand-left",
-      "directions": 4
-    },
-    {
-      "name": "inhand-right",
-      "directions": 4
-    }
-  ]
-}

Resources/Textures/Clothing/Head/Animals/mouse_white.rsi/meta.json

@@ -1,26 +0,0 @@
-{
-  "version": 1,
-  "license": "CC-BY-SA-3.0",
-  "copyright": "Taken from tgstation at commit https://github.com/tgstation/tgstation/commit/4f6190e2895e09116663ef282d3ce1d8b35c032e",
-  "size": {
-    "x": 32,
-    "y": 32
-  },
-  "states": [
-    {
-      "name": "icon"
-    },
-    {
-      "name": "equipped-HELMET",
-      "directions": 4
-    },
-    {
-      "name": "inhand-left",
-      "directions": 4
-    },
-    {
-      "name": "inhand-right",
-      "directions": 4
-    }
-  ]
-}