add RF API and add concept of energy usage to machines + controllers

src/main/java/cofh/api/energy/TileEnergyHandler.java

@@ -0,0 +1,65 @@
+package cofh.api.energy;
+
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.tileentity.TileEntity;
+import net.minecraftforge.common.util.ForgeDirection;
+
+/**
+ * Reference implementation of {@link IEnergyHandler}. Use/extend this or implement your own.
+ *
+ * @author King Lemming
+ *
+ */
+public class TileEnergyHandler extends TileEntity implements IEnergyHandler {
+
+	protected EnergyStorage storage = new EnergyStorage(32000);
+
+	@Override
+	public void readFromNBT(NBTTagCompound nbt) {
+
+		super.readFromNBT(nbt);
+		storage.readFromNBT(nbt);
+	}
+
+	@Override
+	public void writeToNBT(NBTTagCompound nbt) {
+
+		super.writeToNBT(nbt);
+		storage.writeToNBT(nbt);
+	}
+
+	/* IEnergyConnection */
+	@Override
+	public boolean canConnectEnergy(ForgeDirection from) {
+
+		return true;
+	}
+
+	/* IEnergyReceiver */
+	@Override
+	public int receiveEnergy(ForgeDirection from, int maxReceive, boolean simulate) {
+
+		return storage.receiveEnergy(maxReceive, simulate);
+	}
+
+	/* IEnergyProvider */
+	@Override
+	public int extractEnergy(ForgeDirection from, int maxExtract, boolean simulate) {
+
+		return storage.extractEnergy(maxExtract, simulate);
+	}
+
+	/* IEnergyReceiver and IEnergyProvider */
+	@Override
+	public int getEnergyStored(ForgeDirection from) {
+
+		return storage.getEnergyStored();
+	}
+
+	@Override
+	public int getMaxEnergyStored(ForgeDirection from) {
+
+		return storage.getMaxEnergyStored();
+	}
+
+}