Add mod compatibility and edge-case handling

Why does every mod have to do things differently :((

assets/ad_astra/blockstates/glacian_leaves.json

@@ -0,0 +1,66 @@
+{
+    "variants": {
+        "": [
+            {
+                "model": "ad_astra:block/glacian_leaves1"
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves1",
+                "y": 90
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves1",
+                "y": 180
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves1",
+                "y": 270
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves2"
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves2",
+                "y": 90
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves2",
+                "y": 180
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves2",
+                "y": 270
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves3"
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves3",
+                "y": 90
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves3",
+                "y": 180
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves3",
+                "y": 270
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves4"
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves4",
+                "y": 90
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves4",
+                "y": 180
+            },
+            {
+                "model": "ad_astra:block/glacian_leaves4",
+                "y": 270
+            }
+        ]
+    }
+}

assets/ad_astra/models/block/glacian_leaves1.json

@@ -0,0 +1,6 @@
+{
+    "parent": "betterleaves:block/leaves_notint1",
+    "textures": {
+        "all": "ad_astra:block/glacian_leaves"
+    }
+}

assets/ad_astra/models/block/glacian_leaves2.json

@@ -0,0 +1,6 @@
+{
+    "parent": "betterleaves:block/leaves_notint2",
+    "textures": {
+        "all": "ad_astra:block/glacian_leaves"
+    }
+}

assets/ad_astra/models/block/glacian_leaves3.json

@@ -0,0 +1,6 @@
+{
+    "parent": "betterleaves:block/leaves_notint3",
+    "textures": {
+        "all": "ad_astra:block/glacian_leaves"
+    }
+}

assets/ad_astra/models/block/glacian_leaves4.json

@@ -0,0 +1,6 @@
+{
+    "parent": "betterleaves:block/leaves_notint4",
+    "textures": {
+        "all": "ad_astra:block/glacian_leaves"
+    }
+}

assets/ad_astra/models/item/glacian_leaves.json

@@ -0,0 +1,3 @@
+{
+    "parent": "ad_astra:block/glacian_leaves1"
+}