Output the arc cosine of the input
Block that outputs y = acos(u), where
u is an input.

- November 8, 2024, by Michael Wetter:
Added final keyword to unit declaration as block is
only valid for this unit.
Also added displayUnit keyword.
- March 7, 2023, by Jianjun Hu:
Added unit rad to the output.
This is for Buildings,
issue 3277.
- January 28, 2022, by Jianjun Hu:
First implementation, based on the implementation of the Modelica
Standard Library.
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