Set up Turret textures for IronPress

pipeline/pipeline_turret.cmd

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+REM Insurrectionist textures
+ironpress.exe ..\props\Turret\cfg_ironpress.json
+pause > nul

props/Turret/cfg_ironpress.json

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+{
+    "out": "..\\..\\export\\turret\\textures",
+    "in": "textures",
+    "flip_normals": false,
+    "materials": {
+		"mat_turrethead": {
+            "res_out": 1024,
+            "channels": [
+                "basecolor",
+				"arm",
+                "normal"
+            ]
+        },
+		"mat_turretstand": {
+            "res_out": 1024,
+            "channels": [
+                "basecolor",
+				"arm",
+                "normal"
+            ]
+        }
+    }
+}