Add more features to /actions

[dpgraham]

/actions implements the W3C spec, but we could add to it further so that testers can make full use of the Android MotionEvent API's

Some of the features we can add are:

• [ ] pressure, size, orientation, toolMajor, toolMinor, touchMajor, touchMinor (this would be alongside of x and y)
• [ ] Make trackball, eraser, joystick, gamepad as input source (along with mouse, touch and stylus)
• [ ] Allow the setting of arbitrary AXIS values (e.g.: AXIS_UP, AXIS_SCROLL, etc...)

[SrinivasanTarget]

@dpgraham Happy to help incase of any testing req on this.