Extract common Antlr4 generated directory field to super class.

Author: gbevin

src/bld/java/rife/AbstractRife2Build.java

@@ -49,7 +49,9 @@ public AbstractRife2Build()
                 new File(workDirectory(), "embedded_dbs"),
                 new File(workDirectory(), "logs"));
 
+        buildGeneratedDir = new File(buildDirectory(), "generated");
         antlr4Operation
+            .outputDirectory(new File(buildGeneratedDir, "rife/template/antlr"))
             .visitor()
             .longMessages();
 
@@ -72,6 +74,8 @@ public AbstractRife2Build()
                 .link("https://jsoup.org/apidocs/");
     }
 
+    final File buildGeneratedDir;
+
     void propagateJavaProperties(JavaOptions options, String... names) {
         for (var name : names) {
             if (properties().contains(name)) {

src/bld/java/rife/CoreBuild.java

@@ -21,10 +21,8 @@ public CoreBuild()
 
         version = VersionNumber.parse(FileUtils.readString(new File(srcMainResourcesDirectory(), "CORE_VERSION")));
 
-        buildGeneratedDir = new File(buildDirectory(), "generated");
         antlr4Operation
-            .sourceDirectories(List.of(new File(srcMainDirectory(), "antlr")))
-            .outputDirectory(new File(buildGeneratedDir, "rife/template/antlr"));
+            .sourceDirectories(List.of(new File(srcMainDirectory(), "antlr")));
 
         precompileOperation()
             .templateTypes(HTML, XML, SQL);
@@ -67,8 +65,7 @@ public CoreBuild()
                 .signPassphrase(property("sign.passphrase")));
     }
 
-    private final File buildGeneratedDir;
-    private final File srcMainModuleDir;
+    final File srcMainModuleDir;
 
     @Override
     public void javadoc()