Revert 3 commits (work will be continued in branch)

Revert "Disabling mcMMO when the config breaks is dumb"

This reverts commit 86e7bfbf89.

Revert "Config validation rewrite part 1"

This reverts commit 16e90da8fd.

Revert "Update changelog"

This reverts commit 0ccd89fad4.

src/main/java/com/gmail/nossr50/config/ChatConfig.java

@@ -9,6 +9,7 @@ public class ChatConfig extends BukkitConfig {
 
     private ChatConfig() {
         super("chat.yml");
+        validate();
     }
 
     public static ChatConfig getInstance() {
@@ -25,8 +26,8 @@ public class ChatConfig extends BukkitConfig {
     }
 
     @Override
-    protected void validateConfigKeys() {
-        //TODO: Rewrite legacy validation code
+    protected boolean validateKeys() {
+        return true;
     }
 
     public boolean isChatEnabled() {