Add axis names and button names to Joystick.

* This makes controlling the car with the triggers intuitive.
* Right trigger to accelerate.
* Left trigger to decelerate.

* This step helps discover mappings not already pre-existing and
provides a way to dicover and modify defaults.

* Adds Forza mode for the XboxOne controller.

Included directory paths that should match the setup instructions.

Update tubclean webinterface

Add client script for when "PUB_CAMERA_IMAGES = True"

Add script to allow remote cam viewing when images are published by donkeycar using TcpServer (set by "PUB_CAMERA_IMAGES = True" in config file in current codebase)

+ If clip is playing then speed changes from dropdown take effect immediately.
+ Clicking an image in the clip timeline will jump to that frame.

Ref ticket #394 - Readding tubclean web interface files.

+ tubclean interface re-added.
+ Hash values for scripts updated appropriately (Chrome doesn't block them now)
+ Added a "Fast forward 10 seconds" function to the interface.

Adding tensorflow.python prefix to "keras" imports where required

Fix "ShowCnnActivations" by adding tensorflow.python prefix to "keras" imports.

Instructions to build OpenCV from source