Add verbose logging option and a debug method to use it.

Closes #609

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

@@ -0,0 +1,25 @@
+package com.gmail.nossr50.util;
+
+import java.util.logging.Filter;
+import java.util.logging.LogRecord;
+
+import com.gmail.nossr50.mcMMO;
+
+public class LogFilter implements Filter {
+    private boolean debug;
+
+    public LogFilter(mcMMO plugin) {
+        // Doing a config loading lite here, because we can't depend on the config loader to have loaded before any debug messages are sent
+        debug = plugin.getConfig().getBoolean("General.Verbose_Logging");
+    }
+
+    @Override
+    public boolean isLoggable(LogRecord record) {
+        if(record.getMessage().contains("[Debug]") && !debug) {
+            return false;
+        }
+        else {
+            return true;
+        }
+    }
+}