Move API checks into their own class

src/main/java/com/gmail/nossr50/util/CompatibilityCheck.java

@@ -0,0 +1,21 @@
+package com.gmail.nossr50.util;
+
+import com.gmail.nossr50.mcMMO;
+
+import java.lang.reflect.Method;
+
+public class CompatibilityCheck {
+    /**
+     * Uses reflection to check for incompatible server software
+     */
+    public static void checkForOutdatedAPI(boolean serverAPIOutdated, String software) {
+        try {
+            Class<?> checkForClass = Class.forName("org.bukkit.event.block.BlockDropItemEvent");
+            Method newerAPIMethod = checkForClass.getMethod("getItems");
+            Class<?> checkForClassBaseComponent = Class.forName("net.md_5.bungee.api.chat.BaseComponent");
+        } catch (ClassNotFoundException | NoSuchMethodException e) {
+            serverAPIOutdated = true;
+            mcMMO.p.getLogger().severe("You are running an older version of " + software + " that is not compatible with mcMMO, update your server software!");
+        }
+    }
+}