gladevcp - included new widget JogWheel

- this widget simulates a real jogwheel, it works similar
  to the pyvcp jogwheel widget from Anders Wallin

- I exports one halpin, representing the counts value

and has the following propertys

show counts = bool     , whether you want to display the counts in the widget or not
size        = interger , the size of the widget in pixel,
                         allowed values are in the range from 100 to 500,
                         default is 300
cpr         = integer  , The counts per revolution,
                         allowed values are in the range from 25 to 360,
                         default is 40