Added basic entity handling with copy and paste.

Paintings do not currently respawn properly, entity pastes cannot be undone yet, and schematics do not yet store entities
@celticminstrel needs to fix painting spawning

src/main/java/com/sk89q/worldedit/LocalEntity.java

@@ -0,0 +1,40 @@
+/*
+ * WorldEdit
+ * Copyright (C) 2012 sk89q <http://www.sk89q.com> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.sk89q.worldedit;
+
+/**
+ * @author zml2008
+ */
+public abstract class LocalEntity {
+    private final Location position;
+
+    protected LocalEntity(Location position) {
+        this.position = position;
+    }
+
+    public Location getPosition() {
+        return position;
+    }
+
+    public boolean spawn() {
+        return spawn(getPosition());
+    }
+
+    public abstract boolean spawn(Location loc);
+}