eclipse plugin: add the feature for update site

utils/java/plugin_feature/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>WesnothUMCPlugin feature</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.pde.FeatureBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.pde.FeatureNature</nature>
+	</natures>
+</projectDescription>

utils/java/plugin_feature/build.properties

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+bin.includes = feature.xml

utils/java/plugin_feature/feature.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<feature
+      id="Wesnoth_Eclipse_Plugin"
+      label="Wesnoth UMC Plugin Feature"
+      version="0.1"
+      provider-name="Wesnoth">
+
+   <description>
+      This is the Wesnoth Eclipse UMC Plugin developed as part of Google Summer of Code 2010.
+   </description>
+
+   <requires>
+      <import plugin="org.eclipse.ui"/>
+      <import plugin="org.eclipse.core.runtime"/>
+      <import plugin="org.eclipse.core.resources"/>
+      <import plugin="org.eclipse.ui.ide"/>
+      <import plugin="org.eclipse.jface.text" version="3.3.0" match="greaterOrEqual"/>
+      <import plugin="org.eclipse.ui.editors" version="3.3.0" match="greaterOrEqual"/>
+      <import plugin="org.wesnoth.wml.ide" version="1.0.0" match="greaterOrEqual"/>
+      <import plugin="org.wesnoth.wml.ide.generator" version="1.0.0" match="greaterOrEqual"/>
+      <import plugin="org.wesnoth.wml.ide.ui" version="1.0.0" match="greaterOrEqual"/>
+   </requires>
+
+   <plugin
+         id="Wesnoth_Eclipse_Plugin"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"
+         unpack="false"/>
+
+</feature>