Fixed client session clearing bugs. Ignore-this: 7e34e9e729c874c23695030172fc70ed Improved /stats report. More logging. Colorstrip has a 'mode' channel. Enttec dmx needs to be refreshed (udmx does its own). First draft of live-control widgets.

# Abstract UI widgets

class UI(Something):
    pass

class Scale(UI):
    def __init__(self, start, stop, res=0.001):
        pass

""" unfinished
class Button(UI):
    def __init__(self, etc)
"""