OpenGl_ShaderManager::pointSpriteAlphaSrc() now does not return alpha from Red channel
for RGBA marker texture in Core profile.
OpenGl_ShaderManager::prepareStdProgramFlat() - restored code for drawing points without texture.
Built-in GLSL programs now flip .y in shaders instead of
relying on GL_POINT_SPRITE_COORD_ORIGIN unavailable on OpenGL ES.
Added sample markers.tcl (moved from test cases).
Sample now includes marker_kr.png for testing marker orientation.
Make commands syntax to meet coding rules.
Correct angle dimension initialization to allow ellipse input geometry with equal radii.
Change default value of arrow angle for dimensions (from 20 to 12 degrees).
Add arlength, arangle, textmode, textsize to vdimension and vdimparam Draw commands.
Add color parameter to vdimension and vdimparam.
Display dimensions by default.
Add dimensions demo script samples/tcl/dimensions.tcl.
Add file for test case for issue CR25235
Add pre-rendered images for custom markers.
OpenGl_Window - drop overcomplicated find_pixel_format() function
OpenGl_Caps - add option to force software OpenGL imlementation (MS or Apple)
Remove TODO from test case
Add grayscale custom marker to the test
Correct color bitness in attributes list
