Coding - Apply more flags from Clang-tidy (#977)

- Refactor boolean expressions and improve code readability across multiple files
- Simplified boolean expressions by removing unnecessary comparisons to true/false.
- Replaced explicit boolean checks with direct variable usage 

Used flags:
readability-static-accessed-through-instance
readability-simplify-boolean-expr
performance-for-range-copy
performance-move-const-arg
misc-unused-parameters
misc-redundant-expression

src/ModelingAlgorithms/TKExpress/Expr/Expr_ArcCosine.cxx

@@ -67,11 +67,7 @@ bool Expr_ArcCosine::IsIdentical(const occ::handle<Expr_GeneralExpression>& Othe
 
 bool Expr_ArcCosine::IsLinear() const
 {
-  if (ContainsUnknowns())
-  {
-    return false;
-  }
-  return true;
+  return !ContainsUnknowns();
 }
 
 occ::handle<Expr_GeneralExpression> Expr_ArcCosine::Derivative(

src/ModelingAlgorithms/TKExpress/Expr/Expr_ArcSine.cxx

@@ -65,11 +65,7 @@ bool Expr_ArcSine::IsIdentical(const occ::handle<Expr_GeneralExpression>& Other)
 
 bool Expr_ArcSine::IsLinear() const
 {
-  if (ContainsUnknowns())
-  {
-    return false;
-  }
-  return true;
+  return !ContainsUnknowns();
 }
 
 occ::handle<Expr_GeneralExpression> Expr_ArcSine::Derivative(

src/ModelingAlgorithms/TKExpress/Expr/Expr_ArcTangent.cxx

@@ -65,11 +65,7 @@ bool Expr_ArcTangent::IsIdentical(const occ::handle<Expr_GeneralExpression>& Oth
 
 bool Expr_ArcTangent::IsLinear() const
 {
-  if (ContainsUnknowns())
-  {
-    return false;
-  }
-  return true;
+  return !ContainsUnknowns();
 }
 
 occ::handle<Expr_GeneralExpression> Expr_ArcTangent::Derivative(

src/ModelingAlgorithms/TKExpress/Expr/Expr_ArgCosh.cxx

@@ -65,11 +65,7 @@ bool Expr_ArgCosh::IsIdentical(const occ::handle<Expr_GeneralExpression>& Other)
 
 bool Expr_ArgCosh::IsLinear() const
 {
-  if (ContainsUnknowns())
-  {
-    return false;
-  }
-  return true;
+  return !ContainsUnknowns();
 }
 
 occ::handle<Expr_GeneralExpression> Expr_ArgCosh::Derivative(

src/ModelingAlgorithms/TKExpress/Expr/Expr_ArgSinh.cxx

@@ -66,11 +66,7 @@ bool Expr_ArgSinh::IsIdentical(const occ::handle<Expr_GeneralExpression>& Other)
 
 bool Expr_ArgSinh::IsLinear() const
 {
-  if (ContainsUnknowns())
-  {
-    return false;
-  }
-  return true;
+  return !ContainsUnknowns();
 }
 
 occ::handle<Expr_GeneralExpression> Expr_ArgSinh::Derivative(

src/ModelingAlgorithms/TKExpress/Expr/Expr_ArgTanh.cxx

@@ -64,11 +64,7 @@ bool Expr_ArgTanh::IsIdentical(const occ::handle<Expr_GeneralExpression>& Other)
 
 bool Expr_ArgTanh::IsLinear() const
 {
-  if (ContainsUnknowns())
-  {
-    return false;
-  }
-  return true;
+  return !ContainsUnknowns();
 }
 
 occ::handle<Expr_GeneralExpression> Expr_ArgTanh::Derivative(

src/ModelingAlgorithms/TKExpress/Expr/Expr_NamedFunction.cxx

@@ -111,11 +111,7 @@ bool Expr_NamedFunction::IsIdentical(const occ::handle<Expr_GeneralFunction>& fu
       return false;
     }
   }
-  if (!Expression()->IsIdentical(occ::down_cast<Expr_NamedFunction>(func)->Expression()))
-  {
-    return false;
-  }
-  return true;
+  return Expression()->IsIdentical(occ::down_cast<Expr_NamedFunction>(func)->Expression());
 }
 
 bool Expr_NamedFunction::IsLinearOnVariable(const int) const