plugin development: add modules for IDEA Community and Ultimate products

This is needed to allow making a particular version of a plugin compatible with IDEA Community only or with IDEA Community and IDEA Ultimate only (IDEA-187502).

(cherry picked from commit 3ea2dd0f), IDEA-CR-30494

resources/src/META-INF/IdeaPlugin.xml

+<!--
+  ~ Copyright 2000-2018 JetBrains s.r.o.
+  ~
+  ~ 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.
+  -->
+<idea-plugin xmlns:xi="http://www.w3.org/2001/XInclude">
+  <xi:include href="/META-INF/JavaIdePlugin.xml" xpointer="xpointer(/idea-plugin/*)"/>
+
+  <module value="com.intellij.modules.idea"/>
+  <module value="com.intellij.modules.idea.community"/>
+</idea-plugin>