chore: add ExtendAndDereference system test

test/SystemTests/Game/T6/ExtendAndDereference/CombinedZoneT6.zone

@@ -0,0 +1,4 @@
+>game,T6
+
+techniqueset,trivial_floatz_2992w610
+material,test

test/SystemTests/Game/T6/ExtendAndDereference/README.md

@@ -0,0 +1,9 @@
+# Extend and dereference system test
+
+This makes sure that when reusing assets from an existing zone, asset dependencies that are references can be overwritten to be non-references.
+
+In this case:
+
+- The zone `ZoneWithTechsetT6` contains the techniqueset `trivial_floatz_2992w610`
+- The zone `ZoneWithMaterialT6` contains the material `test` and with a reference to its techniqueset `,trivial_floatz_2992w610`
+- The final zone `CombinedZoneT6` is built while loading both of the other fastfile and is expected to contain both the material `test` with a reference to a (actual asset, not a reference) techniqueset `trivial_floatz_2992w610`

test/SystemTests/Game/T6/ExtendAndDereference/ZoneWithMaterialT6.zone

@@ -0,0 +1,4 @@
+>game,T6
+
+ignore,ZoneWithTechsetT6
+material,test

test/SystemTests/Game/T6/ExtendAndDereference/ZoneWithTechsetT6.zone

@@ -0,0 +1,3 @@
+>game,T6
+
+techniqueset,trivial_floatz_2992w610

test/SystemTests/Game/T6/ExtendAndDereference/materials/test.json

@@ -0,0 +1,77 @@
+{
+    "$schema": "http://openassettools.dev/schema/material.v1.json",
+    "_game": "t6",
+    "_type": "material",
+    "_version": 1,
+    "cameraRegion": "none",
+    "constants": [],
+    "contents": 1,
+    "gameFlags": [],
+    "layeredSurfaceTypes": 536870912,
+    "sortKey": 4,
+    "stateBits": [
+        {
+            "alphaTest": "disabled",
+            "blendOpAlpha": "disabled",
+            "blendOpRgb": "disabled",
+            "colorWriteAlpha": true,
+            "colorWriteRgb": true,
+            "cullFace": "back",
+            "depthTest": "disabled",
+            "depthWrite": false,
+            "dstBlendAlpha": "zero",
+            "dstBlendRgb": "zero",
+            "polygonOffset": "offset0",
+            "polymodeLine": false,
+            "srcBlendAlpha": "one",
+            "srcBlendRgb": "one"
+        }
+    ],
+    "stateBitsEntry": [
+        -1,
+        -1,
+        0,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1,
+        -1
+    ],
+    "stateFlags": 0,
+    "surfaceFlags": 0,
+    "surfaceTypeBits": 0,
+    "techniqueSet": "trivial_floatz_2992w610",
+    "textureAtlas": {
+        "columns": 1,
+        "rows": 1
+    },
+    "textures": []
+}