Maven, huge refactor, interface changes

Among other things, these interface changes allow for supporting pre-UUID Minecraft versions again. I may eventually backport older versions, but I don't know that I'll be able to lay hands on old enough jars.
Removed static access
Renamed all methods to follow conventions

src/main/java/com/lishid/openinv/internal/InternalAccessor.java

@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2011-2014 lishid.  All rights reserved.
+ * 
+ * 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,  version 3.
+ * 
+ * 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.lishid.openinv.internal;
+
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+
+import com.lishid.openinv.OpenInv;
+
+public class InternalAccessor {
+
+    private final OpenInv plugin;
+
+    private String version;
+
+    public InternalAccessor(OpenInv plugin) {
+        this.plugin = plugin;
+    }
+
+    /**
+     * Check if the current server version is supported, and, if it is, prepare to load version-specific code.
+     * 
+     * @param server the Server
+     * 
+     * @return true if supported
+     */
+    public boolean initialize(Server server) {
+        String packageName = server.getClass().getPackage().getName();
+        version = packageName.substring(packageName.lastIndexOf('.') + 1);
+
+        try {
+            Class.forName("com.lishid.openinv.internal." + version + ".AnySilentChest");
+            return true;
+        }
+        catch (Exception e) {
+            return false;
+        }
+    }
+
+    private void printErrorMessage() {
+        plugin.getLogger().warning("OpenInv encountered an error with the CraftBukkit version \"" + version + "\". Please look for an updated version of OpenInv.");
+    }
+
+    public IPlayerDataManager newPlayerDataManager() {
+        return (IPlayerDataManager) createObject(IPlayerDataManager.class, "PlayerDataManager");
+    }
+
+    public IInventoryAccess newInventoryAccess() {
+        return (IInventoryAccess) createObject(IInventoryAccess.class, "InventoryAccess");
+    }
+
+    public IAnySilentChest newAnySilentChest() {
+        return (IAnySilentChest) createObject(IAnySilentChest.class, "AnySilentChest");
+    }
+
+    public ISpecialPlayerInventory newSpecialPlayerInventory(Player player, boolean offline) {
+        try {
+            Class<?> internalClass = Class.forName("com.lishid.openinv.internal." + version + ".SpecialPlayerInventory");
+            if (ISpecialPlayerInventory.class.isAssignableFrom(internalClass)) {
+                return (ISpecialPlayerInventory) internalClass.getConstructor(Player.class, Boolean.class).newInstance(player, offline);
+            }
+        }
+        catch (Exception e) {
+            printErrorMessage();
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    public ISpecialEnderChest newSpecialEnderChest(Player player, boolean offline) {
+        try {
+            Class<?> internalClass = Class.forName("com.lishid.openinv.internal." + version + ".SpecialEnderChest");
+            if (ISpecialEnderChest.class.isAssignableFrom(internalClass)) {
+                return (ISpecialEnderChest) internalClass.getConstructor(Player.class, Boolean.class).newInstance(player, offline);
+            }
+        }
+        catch (Exception e) {
+            printErrorMessage();
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    private Object createObject(Class<? extends Object> assignableClass, String className) {
+        try {
+            Class<?> internalClass = Class.forName("com.lishid.openinv.internal." + version + "." + className);
+            if (assignableClass.isAssignableFrom(internalClass)) {
+                return internalClass.getConstructor().newInstance();
+            }
+        }
+        catch (Exception e) {
+            printErrorMessage();
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+}