Refactor Enter Between Braces Handler

Replace `ErlangEnterBetweenBracesHandler` with `ErlangEnterBetweenBracesDelegate` to utilize the updated API. Updated the plugin configuration to register the new delegate for better brace handling functionality.

resources/META-INF/ErlangPlugin.xml

@@ -90,7 +90,7 @@
         <typedHandler implementation="org.intellij.erlang.editor.ErlangTypedHandler" id="ErlangBinary"/>
         <enterHandlerDelegate implementation="org.intellij.erlang.editor.ErlangEnterInCommentsHandler" id="ErlangEnterInComments"/>
         <enterHandlerDelegate implementation="org.intellij.erlang.editor.ErlangEnterHandler" id="ErlangEnter"/>
-        <enterHandlerDelegate implementation="org.intellij.erlang.editor.ErlangEnterBetweenBracesHandler" id="ErlangEnterBetweenBraces"/>
+        <enterBetweenBracesDelegate language="Erlang" implementationClass="org.intellij.erlang.editor.ErlangEnterBetweenBracesDelegate" id="ErlangEnterBwetweenBraces"/>
 
         <extendWordSelectionHandler implementation="org.intellij.erlang.editor.ErlangWordSelectioner" order="last"/>
         <lang.smartEnterProcessor language="Erlang" implementationClass="org.intellij.erlang.editor.ErlangClausesSmartEnterProcessor" id="ErlangClause"/>

src/org/intellij/erlang/editor/ErlangEnterBetweenBracesDelegate.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2012-2015 Sergey Ignatov
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.intellij.erlang.editor;
+
+import com.intellij.codeInsight.editorActions.enter.EnterBetweenBracesDelegate;
+
+public class ErlangEnterBetweenBracesDelegate extends EnterBetweenBracesDelegate {
+  @Override
+  protected boolean isBracePair(char lBrace, char rBrace) {
+    return super.isBracePair(lBrace, rBrace) || lBrace == '[' && rBrace == ']';
+  }
+}