AIS_TextLabel - new public class to display simple text labels (based on MyTextClass private class from Draw Harness).
ViewerTest::Display() - add more reliable replacement for VDisplayAISObject() with no viewer update flag.
vdrawtext command redesign:
- Use new AIS_TextLabel class instead of private MyTextClass.
- Take object name and allow to clear labels from the Viewer.
- Use parameter name + parameter value syntax instead of strict list of mandatory arguments.
- Use [0; 1] range for colors and accept names.
- Drop redundant argument "isMultiByte".
- Support argument -noupdate to skip Viewer update.
Update test cases to new syntax of vdrawtext.
Usage of QAGetPixelColor were checked and corrected.
Using simple comparison instead of regexp.
Improved usage of command vreadpixel for standard colors.
Command QAGetPixelColor was dropped from TKQADraw.
Procedures "checkcolor" and auxiliary "checkpoint" were moved to DrawResources/TestCommands.tcl
Some test cases using "checkcolor" for picking line color were simplified.
Procedures checkcolor and checkpoint were changed to handle situation when pixel is out of view.
Removed unnecessary use of command "vaspects -setwidth" in tests.
Revert -setwidth change in test bugs/vis/bug23525
