Rename to CE-modern, a 1.7.10 port of CE

Position this mod as a port of CE instead of BCx.

- Rename the mod to CE-modern (modid cemodern) and the package to
  net.kanawo.cemodern; the main class is now CEModern.
- Move assets to assets/cemodern and rename the lang key and EMC save
  data to match.
- Describe the mod as a port of CE in the README and mcmod.info.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main/java/net/kanawo/cemodern/gui/GuiHandler.java

@@ -0,0 +1,34 @@
+package net.kanawo.cemodern.gui;
+
+import net.kanawo.cemodern.tile.TileEMCBuilder;
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.tileentity.TileEntity;
+import net.minecraft.world.World;
+
+import cpw.mods.fml.common.network.IGuiHandler;
+
+public class GuiHandler implements IGuiHandler {
+
+    public static final int EMC_BUILDER = 0;
+
+    @Override
+    public Object getServerGuiElement(int id, EntityPlayer player, World world, int x, int y, int z) {
+        TileEMCBuilder builder = getBuilder(id, world, x, y, z);
+        return builder == null ? null : new ContainerEMCBuilder(player.inventory, builder);
+    }
+
+    @Override
+    public Object getClientGuiElement(int id, EntityPlayer player, World world, int x, int y, int z) {
+        TileEMCBuilder builder = getBuilder(id, world, x, y, z);
+        return builder == null ? null : new GuiEMCBuilder(player.inventory, builder);
+    }
+
+    private static TileEMCBuilder getBuilder(int id, World world, int x, int y, int z) {
+        if (id != EMC_BUILDER || !world.blockExists(x, y, z)) {
+            return null;
+        }
+
+        TileEntity tile = world.getTileEntity(x, y, z);
+        return tile instanceof TileEMCBuilder ? (TileEMCBuilder) tile : null;
+    }
+}