Merge with e190c52ab7861c68762aaa552f3dc0f59fe2e225 from default

This revision compiles and runs on Win7x64- but further evaluation is necessary.
There may be an issue with cmake step -After cmake I had to copy rtgui/version.h & config.h into out of source build /rtgui folder.
Additional notes:
- ImProcFunctions::hsv2rgb01   -> this likely need to be added to color.h & color.cc
- Use of array2D should be verified in NR code
- compilation warning for rtengine::RawImageSource::isWBProviderReady()

rtdata/themes/Default.gtkrc

@@ -158,6 +158,12 @@ style "clearlooks-scale" {
 	}
 }
 
+style "clearlooks-thresholdselector" {
+
+	bg[ACTIVE]   = shade (1.15, @rt_bg_color)
+	bg[PRELIGHT] = shade (1.25, @rt_bg_color)
+}
+
 style "clearlooks-vscale" {
 
 	engine "clearlooks" {
@@ -405,6 +411,7 @@ widget "*.partialPasteHeader.*" style "clearlooks-frame_title"
 widget "*.partialPasteHeaderSep" style "clearlooks-partialPasteHeaderSep"
 widget "*.histButton" style "clearlooks-histButton"
 widget "*.FramelessSpinButton" style "clearlooks-framelessspinbutton"
+widget "*.ThresholdSelector" style "clearlooks-thresholdselector"
 
 # The window of the tooltip is called "gtk-tooltip"
 ##################################################################