Starting on adding prefabs for sentrys

@Calclavia i know i havn't gotten the final word from you for giving up
ICBM sentries but i did say i was going to do this either way. What i
will do is avoid recreating the same sentry guns but will focus on new
ones.

src/dark/core/prefab/sentry/BlockSentryPlatform.java

@@ -0,0 +1,21 @@
+package dark.core.prefab.sentry;
+
+import net.minecraft.block.material.Material;
+import dark.core.common.DarkMain;
+import dark.core.prefab.machine.BlockMachine;
+
+/** Base platform for all sentry and turret's created to use for power, logic, and inventory
+ * connections to the world.
+ * 
+ * @author DarkGuardsman */
+public class BlockSentryPlatform extends BlockMachine
+{
+
+    public BlockSentryPlatform()
+    {
+        super(DarkMain.CONFIGURATION, "DMSentryPlatform", Material.iron);
+        this.setResistance(100);
+        this.setHardness(100);
+    }
+
+}

src/dark/core/prefab/sentry/TileEntityAutoSentry.java

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+package dark.core.prefab.sentry;
+
+public class TileEntityAutoSentry
+{
+
+}

src/dark/core/prefab/sentry/TileEntityMountedSentry.java

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+package dark.core.prefab.sentry;
+
+public class TileEntityMountedSentry
+{
+
+}

src/dark/core/prefab/sentry/TileEntitySentry.java

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+package dark.core.prefab.sentry;
+
+public class TileEntitySentry
+{
+
+}