Fixes issue where images come out as BGR instead of RGB for Jeston Nano

Detect loading of unrecognised model file types.

Add 'else' clause to loading model files to capture unknown file extension types (i.e. NOT .h5 or .json)

Fix training split (issue 406)

Reintroduce the much improved Calibrate function

Does not have 10-loop limit, provides interactive method to exit from utility.

Fix tubplot to NOT provide its own default model type.

Add the model type to the tubplot title.

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.