Allow curve usage in function parameters

Dmitri Naumovrequested to merge
endJunction/ogs:AllowCurveUsageInFunctionParameters into master

For example for a given curve c from the <curves> section a Function type parameter can handle an expressions like

<expression>c(pi * sin(t))</expression>
  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behavior change was documented?
Edited by Dmitri Naumov

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