remove unused apple.jar, bump to Java 17

Author: benfry

app/build.xml

@@ -149,14 +149,13 @@
     <!-- env used to set classpath below -->
     <property environment="env" />
 
-    <javac source="11"
-           target="11"
+    <javac source="17"
+           target="17"
            destdir="bin"
            excludes="**/tools/format/**"
            encoding="UTF-8"
            includeAntRuntime="false"
            classpath="../core/library/core.jar;
-                      ../core/apple.jar;
                       lib/ant.jar;
                       lib/ant-launcher.jar;
                       lib/flatlaf.jar;