Replace references to NEU with Firmament

src/main/kotlin/moe/nea/firmament/util/MC.kt

@@ -0,0 +1,13 @@
+package moe.nea.firmament.util
+
+import io.github.moulberry.repo.data.Coordinate
+import net.minecraft.client.MinecraftClient
+import net.minecraft.util.math.BlockPos
+
+object MC {
+    inline val player get() = MinecraftClient.getInstance().player
+    inline val world get() = MinecraftClient.getInstance().world
+}
+
+val Coordinate.blockPos: BlockPos
+    get() = BlockPos(x, y, z)