Fixed min/max setting for floating point images
And made sure that KNOB_RELEASED_PROPERTY is always fired on
changes in the text fields
Fixed a bug in NumericalTextField and removed some unused code
Fixed: Textfields for channel sliders often too small
Added a popup warning message, when out-of-range values are entered
Merge pull request #3108 from dominikl/min_max_channelslider_fix

Fixed bug ChannelSlider (rendering settings)