0032121: Draw Harness, ViewerTest - implement -reset option for vlight command

vlight command has been revised to provide more friendly syntax.
Command now accepts light index or name as first argument.
Added arguments -enable/-disable for managing enabled state.
Added argument -reset to reset light parameters to default values.

V3d_Viewer::SetDefaultLights() now sets names "headlight" and "ambient" to created lights.
Graphic3d_TypeOfLightSource enumeration values have been renamed to avoid shortcuts.
Draw::Atof(), applied corrections to avoid explicit new/delete calls.

tests/opengl/data/raytrace/bug25201

@@ -22,7 +22,7 @@ vdisplay s1 s2
 vsetmaterial s1 Gold
 vsetmaterial s2 Silver
 vsetlocation s1 0.0 0.1 0.0
-vlight -change 0 -dir 0.667 -0.667 -0.333
+vlight -change 0 -dir 0.667 -0.667 -0.333 -smoothAngle 6 -intensity 100
 vturnview 3.0 -1.2 -0.1
 vfit
 
@@ -33,8 +33,6 @@ vrenderparams -rayDepth 12
 
 set aModeNum 0
 
-vlight change 0 sm 0.1
-vlight change 0 int 100
 vbsdf s1 roughness 6400
 
 vfps 200
@@ -52,4 +50,4 @@ vsetmaterial s2 plaster
 
 vfps 200
 vdump $imagedir/${casename}_${aModeNum}.png
-incr aModeNum
+incr aModeNum

tests/opengl/data/raytrace/refraction

@@ -72,6 +72,6 @@ vfront
 vturnview 0 -0.3 0
 vfit
 vlight -change 0 -dir -0.577 -0.577 -0.577
-vlight add directional
+vlight dirlight -type directional
 vrenderparams -raytrace -raydepth 5 -shadows off -reflections -fsaa
 vdump ${imagedir}/${casename}.png