[Revert] Reverts Ninja (#15516)

* Revert "[Antag] add space ninja as midround antag (#14069)"

This reverts commit c1cda0dbf8.

* Revert "[Fix] move ninja objectives into NinjaRole (#15490)"

This reverts commit 251f429fb3.

Resources/Textures/Objects/Weapons/Bombs/spidercharge.rsi/meta.json

@@ -1,31 +0,0 @@
-{
-    "version": 1,
-	"license": "CC-BY-SA-3.0",
-	"copyright": "Taken from tgstation at https://github.com/tgstation/tgstation/commit/db2efd4f0df2b630a8bb9851f53f4922b669a5b3",
-    "size": {
-        "x": 32,
-        "y": 32
-    },
-    "states": [
-        {
-            "name": "icon"
-        },
-        {
-            "name": "primed",
-            "delays": [
-                [
-                    0.1,
-                    0.1
-                ]
-            ]
-        },
-        {
-            "name": "inhand-left",
-            "directions": 4
-		},
-        {
-            "name": "inhand-right",
-            "directions": 4
-		}
-    ]
-}

Resources/Textures/Objects/Weapons/Melee/energykatana.rsi/meta.json

@@ -1,26 +0,0 @@
-{
-  "version": 1,
-  "license": "CC-BY-SA-3.0",
-  "copyright": "Taken from tgstation at https://github.com/tgstation/tgstation/commit/a9451f4d22f233d328b63490c2bcf64a640e42ff",
-  "size": {
-    "x": 32,
-    "y": 32
-  },
-  "states": [
-    {
-      "name": "icon"
-    },
-    {
-      "name": "equipped-BELT",
-      "directions": 4
-    },
-    {
-      "name": "inhand-left",
-      "directions": 4
-    },
-    {
-      "name": "inhand-right",
-      "directions": 4
-    }
-  ]
-}