Wrap IMAQdx functions.

Quite a few functions aren't wrapped, but the most critical ones for
vision should be.

This also fixes a couple of issues:
- nivision_arm.ini (and imaqdx_arm.ini) are now generated without need for
  running the output on the RoboRIO.
- enum values are generated even if the value is not directly specified.

wpilibj/wpilibJavaJNI/nivision/get_struct_size.py

@@ -0,0 +1,14 @@
+from __future__ import print_function
+import sys
+
+def main():
+    for line in sys.stdin:
+        line = line.strip()
+        if not line.startswith("#STRUCT_SIZER"):
+            continue
+        line = line[14:]
+        line = line.replace("#", "")
+        print(line)
+
+if __name__ == "__main__":
+    main()