Add new joystick features

Axis counts other than six and POVs are both present in C++ and Java now

Add dynamic joystick axis counts, up to 12

Change-Id: Ieade5e61a89df822df8702cb32326e4635558778

Add support for POVs in C++

Change-Id: I12dc0fcaca605a256ddcf990eebde45767229171

Make POVs work in Java

Change-Id: Ie2d98adb416c1930f058bdd21c3e7d26289df503

wpilibj/wpilibJava/src/main/java/edu/wpi/first/wpilibj/GenericHID.java

@@ -152,4 +152,10 @@ public abstract class GenericHID {
      * @return true if the button is pressed
      */
     public abstract boolean getRawButton(int button);
+
+    public abstract int getPOV(int pov);
+
+    public int getPOV() {
+        return getPOV(1);
+    }
 }