Add Java nivision wrappers.

Only very basic testing performed to date.

The wrappers are still a bit incomplete (some structures and functions),
but are much more complete than the old ones.

Fixes artf3796.

Changes from initial changeset:
- Use // for comments.
- Add auto-generate notices to the beginning of each generated file.
- Include error number with error text in exception.
- Add free() function to structures.
- Fix out-of-order / non-array enums.
- Avoid duplicate calls to DisposedStruct.write() as .getAddress() does it.
- Refactor OpaqueStruct.
- Default to no null allowed except when overridden.
- Implement unowned return values.
- Add gen_struct_sizer script.

Change-Id: Ie0d102c45817ea8812d98fe4938d1a2255c61664

wpilibj/wpilibJavaDevices/src/main/java/com/ni/vision/VisionException.java

@@ -0,0 +1,20 @@
+//
+// This file is auto-generated by wpilibj/wpilibJavaJNI/nivision/gen_java.py
+// Please do not edit!
+//
+
+package com.ni.vision;
+
+public class VisionException extends RuntimeException {
+
+    private static final long serialVersionUID = 1L;
+
+    public VisionException(String msg) {
+        super(msg);
+    }
+
+    @Override
+    public String toString() {
+        return "VisionException [" + super.toString() + "]";
+    }
+}