0032208: Tests - refactor visualization tests to cover several graphic drivers

Removed testgrids 'bugs/vis' and '3rdparty'; tests have been redistributed across other grids.
Moved testgrid 'v3d/ivtk' into dedicated 'vtk/ivtk'.

Added testgrid 'vselect' dedicated to 3D viewer picking/selection functionality
and filled with tests from 'v3d/vertex', 'v3d/face' and similar groups.

Added testgrid 'opengl' dedicated to OpenGL driver low-level functionality (GLSL programs and similar)
and filled with tests from 'v3d/glsl', 'v3d/raytrace', '3rdparty/fonts', 'bugs/vis' (portion) and similar.

Added testgrid 'opengles3' dedicated to OpenGL ES 3.0 driver low-level functionality
and reusing tests from 'opengl' testgrid.
Subgroup 'opengles3/raytrace' is disabled on Windows, as Ray-Tracing currently requires OpenGL ES 3.2.
while ANGLE library implements only OpenGL ES 3.0.

Added testgrid 'opengles2' dedicated to OpenGL ES 2.0 driver low-level functionality
and reusing a limited subset of passing tests from 'opengl' testgrid.
Currently testgrid is activated only on Windows platform when using ANGLE library
(properietary OpenGL ES drivers do not allow creation of restricted 2.0 context).

Test cases have been cleaned out to put bug description into log,
to properly load necessary plugins and to explicitly dump viewer.

tests/opengl/data/text/D1

@@ -0,0 +1,31 @@
+puts "==========="
+puts "0026343: Visualization - Zoom persistent text with 3D orientation"
+puts ""
+puts "==========="
+
+pload MODELING VISUALIZATION
+
+vfont add [locate_data_file DejaVuSans.ttf] SansFont
+
+vinit View1
+vclear
+vaxo
+
+set x 10
+set y 50
+set z 30
+
+box b $x $y $z
+vdisplay b
+vtrihedron tri0
+
+vdrawtext t0 "Top text on plane yOz" -pos $x 0 $z -color green -height 20 -plane 1 0 0 0 1 0 -valign top -font SansFont
+vdrawtext t1 "Bottom text on plane yOz" -pos 0 $y 0 -color green -height 20 -plane -1 0 0 0 -1 0 -valign bottom -font SansFont
+
+vdrawtext t2 "Some text on the top face" -pos $x/2 $y/2 $z -color red -height 20 -plane 0 0 1 0 1 0 -valign center -halign center -font SansFont
+
+vdrawtext t3 "First line\nSecond line" -pos $x/2 0 $z/2 -color 0.0 0.0 1.0 -height 20 -plane 0 -1 0 0 0 1 -valign center -halign center -font SansFont
+
+vfit
+vglinfo
+vdump $imagedir/${casename}.png