upgrade to antlr 4.7

.classpath

@@ -2,7 +2,7 @@
 <classpath>
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
-	<classpathentry kind="lib" path="lib/antlr-4.4-complete.jar"/>
 	<classpathentry kind="lib" path="lib/junit.jar"/>
+	<classpathentry kind="lib" path="lib/antlr-4.7-complete.jar" sourcepath="lib/antlr-4.7-source.zip"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>

.gitignore

@@ -1,2 +1,2 @@
 bin/
-src/pp/
+src/pp/iloc

.project

@@ -5,6 +5,11 @@
 	<projects>
 	</projects>
 	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.xtext.ui.shared.xtextBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
 		<buildCommand>
 			<name>org.eclipse.jdt.core.javabuilder</name>
 			<arguments>
@@ -13,5 +18,6 @@
 	</buildSpec>
 	<natures>
 		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.xtext.ui.shared.xtextNature</nature>
 	</natures>
 </projectDescription>