Icons for Blocks.Logical (LessThreshold, LessEqualThreshold, GreaterThreshold and GreaterEqualThreshold) misleading when flipped

[max-privato]

The icon of LessThreshold is a sign "<". When the component is used as is, it is meaningful.
If the component flipped horizontally, the same icon "<" is displayed, which indicates greater instead of less!

Also GreaterThreshold is affected by this issue. The issue can be solved using a drawing for the less or greater symbol instead of a character.

Less, Greater, LessEqual and GreaterEqual are unaffected, since their icons are already drawings.

[beutlich]

Left over from #745. Will prepare a pull request.

[max-privato]

Thank you for implementing my suggestion.
After some usage, and getting other people involved, I came to the conclusion that the icon is still confusing. The issue is that when we use the symbol "<" we want to have two terms to compare. In Greater and Less somehow we have them, in GreaterThreshold, and LessThreshold, even with the modification I suggested we still don't have.

I made some tests with both Dymola and Openmodelica, and using the text "Th" as a placeholder for threshold seems good enough, and well coordinated with the existing Less and Greater icons.
The annotation code for LessThreshold that I tested (for me satisfactorily) is as follows (excluding Documentation):

 annotation (Icon(coordinateSystem(preserveAspectRatio=true,
  extent={{-100,-100},
         {100,100}}), graphics={
          Line(points={{-36,20},{-82,0},{-36,-20}},
          thickness=0.5), Text(
          extent={{-26,48},{46,-48}},
          lineColor={0,0,0},
          textString="Th",
          horizontalAlignment=TextAlignment.Left)}),
          [...]

@beutlich, do you agree with this further enhancement? If you do, obviously also GreaterThreshold should be changed accordingly.

[beutlich]

@beutlich, do you agree with this further enhancement?

Forwarding to library officers @AHaumer and @MartinOtter .