Deactivate AutoExposure when trying to change exposure parameters

[flyingbarron]

Today, if the AutoExposure checkbox is marked, you cannot modify Exp. Time or Gain. you need to uncheck the box so that the option is activated.

Proposed change - Allow changing the values of the Exp Time and Gain at any time. If the user clicks "set" then the new value will become active and the AutoExposure checkbox will be cleared.