Fixes vibrant quartz glass using the wrong model.

Fixes matrix frame not having a model (the block is transparent though).
Don't register an item model for the invalid part anymore.
Make variant registration for items more explicit.
This fixes #5

src/main/resources/assets/appliedenergistics2/blockstates/matrix_frame.json

@@ -0,0 +1,7 @@
+{
+  "variants": {
+    "normal": {
+      "model": "appliedenergistics2:matrix_frame"
+    }
+  }
+}

src/main/resources/assets/appliedenergistics2/blockstates/quartz_vibrant_glass.json

@@ -1,31 +1,7 @@
 {
-    "multipart": [
-        {
-            "apply": [{ "model": "appliedenergistics2:quartz_glass_1" }, { "model": "appliedenergistics2:quartz_glass_2" }, { "model": "appliedenergistics2:quartz_glass_3" }, { "model": "appliedenergistics2:quartz_glass_4" }]
-        },
-        {
-            "when": { "down": "false" },
-            "apply": { "model": "appliedenergistics2:quartz_glass_frame", "x": 90 }
-        },
-        {
-            "when": { "up": "false" },
-            "apply": { "model": "appliedenergistics2:quartz_glass_frame", "x": -90 }
-        },
-        {
-            "when": { "north": "false" },
-            "apply": { "model": "appliedenergistics2:quartz_glass_frame"}
-        },
-        {
-            "when": { "south": "false" },
-            "apply": { "model": "appliedenergistics2:quartz_glass_frame", "y": 180 }
-        },
-        {
-            "when": { "west": "false" },
-            "apply": { "model": "appliedenergistics2:quartz_glass_frame", "y": -90 }
-        },
-        {
-            "when": { "east": "false" },
-            "apply": { "model": "appliedenergistics2:quartz_glass_frame", "y": 90 }
+    "variants": {
+        "normal": {
+            "model": "appliedenergistics2:builtin/quartz_glass"
         }
-    ]
-}
+    }
+}

src/main/resources/assets/appliedenergistics2/models/block/matrix_frame.json

@@ -0,0 +1,3 @@
+{
+  "elements": []
+}