add a bunch of classes to classpath and flesh out a few existing ones

classpath/java/lang/reflect/Field.java

@@ -0,0 +1,21 @@
+package java.lang.reflect;
+
+public class Field<T> extends AccessibleObject {
+  private byte vmFlags;
+  private byte code;
+  private short flags;
+  private short offset;
+  private byte[] name;
+  private byte[] spec;
+  private Class<T> class_;
+
+  private Field() { }
+
+  public boolean isAccessible() {
+    return (vmFlags & Accessible) != 0;
+  }
+
+  public void setAccessible(boolean v) {
+    if (v) vmFlags |= Accessible; else vmFlags &= ~Accessible;
+  }
+}